{"id":38718,"date":"2026-03-21T12:58:20","date_gmt":"2026-03-21T10:58:20","guid":{"rendered":"https:\/\/diagnozabam.ro\/sfaturi\/?p=38718"},"modified":"2026-03-21T12:58:20","modified_gmt":"2026-03-21T10:58:20","slug":"p0402-egr-excessive-flow-diesel-power-loss","status":"publish","type":"post","link":"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0402-egr-excessive-flow-diesel-power-loss\/","title":{"rendered":"P0402 \u2013 EGR Excessive Flow? Diesel Power Loss!"},"content":{"rendered":"<figure id=\"attachment_38712\" aria-describedby=\"caption-attachment-38712\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" id=\"longdesc-return-38712\" class=\"size-full wp-image-38712\" tabindex=\"-1\" title=\"https www berrimadiesel com EGR clogged\" src=\"https:\/\/diagnozabam.ro\/sfaturi\/wp-content\/uploads\/2026\/02\/https-www.berrimadiesel.com-egr-clogged.webp\" alt=\"https www berrimadiesel com EGR clogged\" width=\"1200\" height=\"800\" longdesc=\"https:\/\/diagnozabam.ro\/sfaturi?longdesc=38712&amp;referrer=38718\" srcset=\"https:\/\/diagnozabam.ro\/sfaturi\/wp-content\/uploads\/2026\/02\/https-www.berrimadiesel.com-egr-clogged.webp 1200w, https:\/\/diagnozabam.ro\/sfaturi\/wp-content\/uploads\/2026\/02\/https-www.berrimadiesel.com-egr-clogged-768x512.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-38712\" class=\"wp-caption-text\">https www berrimadiesel com <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> clogged<\/figcaption><\/figure>\n<p data-start=\"810\" data-end=\"999\">\nThe <strong data-start=\"814\" data-end=\"823\">P0402<\/strong> fault code signals that the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">Exhaust<\/a> Gas Recirculation (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a>) system is flowing more <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gas than the engine control module (ECM) expects under current operating conditions.<\/p>\n<p data-start=\"1001\" data-end=\"1320\">While <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> is essential for reducing <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">NOx<\/a> <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a>, excessive recirculation disrupts the delicate balance between fresh intake air and <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gases. When <strong data-start=\"1155\" data-end=\"1164\">P0402<\/strong> is triggered, the engine is effectively being \u201cover-diluted\u201d with <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gas, leading to combustion instability, power loss and increased soot production.<\/p>\n<p data-start=\"1322\" data-end=\"1537\">Unlike minor sensor faults, <strong data-start=\"1350\" data-end=\"1359\">P0402<\/strong> often points to mechanical sticking inside the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> valve or severe carbon buildup. If ignored, it can indirectly accelerate <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-dpf-removal-the-whole-truth-and-real-risks\/\">DPF<\/a> clogging, <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0234-code-turbo-overboost-engine-danger\/\">turbo<\/a> inefficiency and injector stress.<\/p>\n<p data-start=\"1539\" data-end=\"1673\">In this premium guide, I explain how <strong data-start=\"1576\" data-end=\"1585\">P0402<\/strong> develops, how it interacts with other diesel systems, and how to diagnose it correctly.<\/p>\n<hr data-start=\"1675\" data-end=\"1678\" \/>\n<h2 data-start=\"1680\" data-end=\"1713\">What Does P0402 Actually Mean?<\/h2>\n<p data-start=\"1715\" data-end=\"1760\">The official <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0229-code-throttle-pedal-position-sensor-c-intermittent\/\">OBD2<\/a> definition of <strong data-start=\"1747\" data-end=\"1756\">P0402<\/strong> is:<\/p>\n<p data-start=\"1762\" data-end=\"1818\"><strong data-start=\"1762\" data-end=\"1818\">\u201cExhaust Gas Recirculation Flow Excessive Detected.\u201d<\/strong><\/p>\n<p data-start=\"1820\" data-end=\"1978\">The ECM commands the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> valve to operate within a specific <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/electric-car-range-2026-real-conditions-explained\/\">range<\/a>. It then monitors intake pressure, airflow and oxygen levels to confirm the expected change.<\/p>\n<p data-start=\"1980\" data-end=\"2055\">If the detected change exceeds calculated values, the ECM stores <strong data-start=\"2045\" data-end=\"2054\">P0402<\/strong>.<\/p>\n<p data-start=\"2057\" data-end=\"2220\">The <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0229-code-throttle-pedal-position-sensor-c-intermittent\/\">OBD2<\/a> framework is standardized by organizations such as <strong data-start=\"2117\" data-end=\"2138\">SAE International<\/strong> (<a class=\"decorated-link\" href=\"https:\/\/www.sae.org\" target=\"_new\" rel=\"noopener\" data-start=\"2140\" data-end=\"2159\">https:\/\/www.sae.org<\/a>), ensuring consistent diagnostic logic across manufacturers.<\/p>\n<hr data-start=\"2222\" data-end=\"2225\" \/>\n<h2 data-start=\"2227\" data-end=\"2265\">Why Excessive EGR Flow Is Dangerous<\/h2>\n<p data-start=\"2267\" data-end=\"2382\">At first glance, more <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> may not sound serious. In reality, excessive <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> flow causes several internal imbalances:<\/p>\n<h3 data-start=\"2384\" data-end=\"2430\">\ud83d\udd25 1. Reduced Oxygen in Combustion Chamber<\/h3>\n<p data-start=\"2432\" data-end=\"2548\">Too much <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gas displaces fresh air. Diesel engines rely on high oxygen concentration for efficient combustion.<\/p>\n<p data-start=\"2550\" data-end=\"2557\">Result:<\/p>\n<ul data-start=\"2558\" data-end=\"2636\">\n<li data-start=\"2558\" data-end=\"2583\">\n<p data-start=\"2560\" data-end=\"2583\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0209-code-injector-circuit-cylinder-9-fault\/\">Incomplete combustion<\/a><\/p>\n<\/li>\n<li data-start=\"2584\" data-end=\"2606\">\n<p data-start=\"2586\" data-end=\"2606\">Higher soot output<\/p>\n<\/li>\n<li data-start=\"2607\" data-end=\"2636\">\n<p data-start=\"2609\" data-end=\"2636\">Reduced engine efficiency<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2638\" data-end=\"2677\">\ud83c\udf2a 2. Turbocharger Efficiency Drops<\/h3>\n<p data-start=\"2679\" data-end=\"2790\">Turbochargers depend on balanced <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> pressure and intake airflow. When <strong data-start=\"2754\" data-end=\"2763\">P0402<\/strong> causes excessive dilution:<\/p>\n<ul data-start=\"2792\" data-end=\"2902\">\n<li data-start=\"2792\" data-end=\"2819\">\n<p data-start=\"2794\" data-end=\"2819\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/hybrid-turbo-what-it-is-how-it-works\/\">Boost pressure<\/a> may drop<\/p>\n<\/li>\n<li data-start=\"2820\" data-end=\"2857\">\n<p data-start=\"2822\" data-end=\"2857\">Air mass readings become unstable<\/p>\n<\/li>\n<li data-start=\"2858\" data-end=\"2902\">\n<p data-start=\"2860\" data-end=\"2902\">Underboost conditions (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0299-code-turbo-underboost-major-risk\/\">P0299<\/a>) may appear<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2904\" data-end=\"2935\">\ud83e\uddf1 3. Faster DPF Saturation<\/h3>\n<p data-start=\"2937\" data-end=\"2992\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0209-code-injector-circuit-cylinder-9-fault\/\">Incomplete combustion<\/a> increases particulate production.<\/p>\n<p data-start=\"2994\" data-end=\"3017\">This can contribute to:<\/p>\n<ul data-start=\"3018\" data-end=\"3127\">\n<li data-start=\"3018\" data-end=\"3060\">\n<p data-start=\"3020\" data-end=\"3060\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/obd2-winter-codes-what-they-mean-and-why-they-appear\/\">P2002<\/a> (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-dpf-removal-the-whole-truth-and-real-risks\/\">DPF<\/a> efficiency below threshold)<\/p>\n<\/li>\n<li data-start=\"3061\" data-end=\"3100\">\n<p data-start=\"3063\" data-end=\"3100\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/obd2-winter-codes-what-they-mean-and-why-they-appear\/\">P2463<\/a> (excessive soot accumulation)<\/p>\n<\/li>\n<li data-start=\"3101\" data-end=\"3127\">\n<p data-start=\"3103\" data-end=\"3127\">Frequent regenerations<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"3129\" data-end=\"3132\" \/>\n<h2 data-start=\"3134\" data-end=\"3161\">Common Symptoms of P0402<\/h2>\n<p data-start=\"3163\" data-end=\"3210\">When <strong data-start=\"3168\" data-end=\"3177\">P0402<\/strong> is active, symptoms may include:<\/p>\n<ul data-start=\"3212\" data-end=\"3395\">\n<li data-start=\"3212\" data-end=\"3226\">\n<p data-start=\"3214\" data-end=\"3226\">Rough idle<\/p>\n<\/li>\n<li data-start=\"3227\" data-end=\"3258\">\n<p data-start=\"3229\" data-end=\"3258\">Engine vibration at low RPM<\/p>\n<\/li>\n<li data-start=\"3259\" data-end=\"3284\">\n<p data-start=\"3261\" data-end=\"3284\">Sluggish acceleration<\/p>\n<\/li>\n<li data-start=\"3285\" data-end=\"3311\">\n<p data-start=\"3287\" data-end=\"3311\">Noticeable <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">black smoke<\/a><\/p>\n<\/li>\n<li data-start=\"3312\" data-end=\"3342\">\n<p data-start=\"3314\" data-end=\"3342\">Increased fuel consumption<\/p>\n<\/li>\n<li data-start=\"3343\" data-end=\"3372\">\n<p data-start=\"3345\" data-end=\"3372\">Possible stalling at idle<\/p>\n<\/li>\n<li data-start=\"3373\" data-end=\"3395\">\n<p data-start=\"3375\" data-end=\"3395\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-faulty-maf-sensor-symptoms-causes-fixes\/\">Check Engine<\/a> Light<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3397\" data-end=\"3446\">In severe cases, the vehicle may enter <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-goes-into-limp-mode-what-it-really-means\/\">limp mode<\/a>.<\/p>\n<p data-start=\"3448\" data-end=\"3554\">Unlike <strong data-start=\"3455\" data-end=\"3464\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0401-error-on-diesel-cars-causes-real-fixes\/\">P0401<\/a><\/strong>, which often feels subtle, <strong data-start=\"3492\" data-end=\"3501\">P0402<\/strong> tends to produce more noticeable drivability issues.<\/p>\n<hr data-start=\"3556\" data-end=\"3559\" \/>\n<h2 data-start=\"3561\" data-end=\"3591\">Most Common Causes of P0402<\/h2>\n<h3 data-start=\"3593\" data-end=\"3621\">1\ufe0f\u20e3 EGR Valve Stuck Open<\/h3>\n<p data-start=\"3623\" data-end=\"3756\">This is the most frequent cause. Carbon deposits prevent the valve from closing completely, allowing constant excessive <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> flow.<\/p>\n<h3 data-start=\"3758\" data-end=\"3791\">2\ufe0f\u20e3 Heavy Carbon Accumulation<\/h3>\n<p data-start=\"3793\" data-end=\"3870\">High-mileage diesel engines accumulate thick soot layers inside <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> passages.<\/p>\n<h3 data-start=\"3872\" data-end=\"3906\">3\ufe0f\u20e3 Faulty EGR Position Sensor<\/h3>\n<p data-start=\"3908\" data-end=\"3968\">The ECM may receive incorrect feedback about valve position.<\/p>\n<h3 data-start=\"3970\" data-end=\"4005\">4\ufe0f\u20e3 MAP \/ MAF Sensor Inaccuracy<\/h3>\n<p data-start=\"4007\" data-end=\"4084\">Incorrect airflow readings may mislead the ECM into detecting excessive flow.<\/p>\n<h3 data-start=\"4086\" data-end=\"4120\">5\ufe0f\u20e3 Wiring or Actuator Failure<\/h3>\n<p data-start=\"4122\" data-end=\"4175\">Electrical faults can leave the valve partially open.<\/p>\n<hr data-start=\"4177\" data-end=\"4180\" \/>\n<h2 data-start=\"4182\" data-end=\"4223\">Advanced Diagnostic Strategy for P0402<\/h2>\n<p data-start=\"4225\" data-end=\"4272\">Proper diagnosis goes beyond clearing the code.<\/p>\n<h3 data-start=\"4274\" data-end=\"4301\">Step 1 \u2013 Full OBD2 Scan<\/h3>\n<p data-start=\"4302\" data-end=\"4355\">Check for related <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/obd2-winter-codes-what-they-mean-and-why-they-appear\/\">codes<\/a> (P0400, <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0401-error-on-diesel-cars-causes-real-fixes\/\">P0401<\/a>, <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0299-code-turbo-underboost-major-risk\/\">P0299<\/a>, <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/obd2-winter-codes-what-they-mean-and-why-they-appear\/\">P2002<\/a>).<\/p>\n<h3 data-start=\"4357\" data-end=\"4388\">Step 2 \u2013 Live Data Analysis<\/h3>\n<p data-start=\"4389\" data-end=\"4397\">Compare:<\/p>\n<ul data-start=\"4398\" data-end=\"4494\">\n<li data-start=\"4398\" data-end=\"4424\">\n<p data-start=\"4400\" data-end=\"4424\">Commanded <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> position<\/p>\n<\/li>\n<li data-start=\"4425\" data-end=\"4448\">\n<p data-start=\"4427\" data-end=\"4448\">Actual <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> position<\/p>\n<\/li>\n<li data-start=\"4449\" data-end=\"4465\">\n<p data-start=\"4451\" data-end=\"4465\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-faulty-maf-sensor-symptoms-causes-fixes\/\">MAF<\/a> readings<\/p>\n<\/li>\n<li data-start=\"4466\" data-end=\"4494\">\n<p data-start=\"4468\" data-end=\"4494\">Intake manifold pressure<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"4496\" data-end=\"4522\">Step 3 \u2013 Actuator Test<\/h3>\n<p data-start=\"4523\" data-end=\"4623\">Using professional diagnostic tools, activate and deactivate the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> valve while monitoring airflow.<\/p>\n<h3 data-start=\"4625\" data-end=\"4657\">Step 4 \u2013 Physical Inspection<\/h3>\n<p data-start=\"4658\" data-end=\"4691\">Remove the valve and inspect for:<\/p>\n<ul data-start=\"4692\" data-end=\"4758\">\n<li data-start=\"4692\" data-end=\"4711\">\n<p data-start=\"4694\" data-end=\"4711\">Carbon blockage<\/p>\n<\/li>\n<li data-start=\"4712\" data-end=\"4735\">\n<p data-start=\"4714\" data-end=\"4735\">Mechanical sticking<\/p>\n<\/li>\n<li data-start=\"4736\" data-end=\"4758\">\n<p data-start=\"4738\" data-end=\"4758\">Cooler obstruction<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4760\" data-end=\"4875\">Cleaning may resolve mild cases of <strong data-start=\"4795\" data-end=\"4804\">P0402<\/strong>.<br data-start=\"4805\" data-end=\"4808\" \/>If the valve mechanism is worn or damaged, replacement is required.<\/p>\n<p data-start=\"4877\" data-end=\"4956\">More diesel <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0229-code-throttle-pedal-position-sensor-c-intermittent\/\">OBD2<\/a> technical guides are available at:<br data-start=\"4928\" data-end=\"4931\" \/>\ud83d\udc49 <a class=\"decorated-link\" href=\"https:\/\/diagnozabam.ro\" target=\"_new\" rel=\"noopener\" data-start=\"4934\" data-end=\"4956\">https:\/\/diagnozabam.ro<\/a><\/p>\n<hr data-start=\"4958\" data-end=\"4961\" \/>\n<h2 data-start=\"4963\" data-end=\"5005\">Repair Costs for P0402 (2026 Estimates)<\/h2>\n<ul data-start=\"5007\" data-end=\"5155\">\n<li data-start=\"5007\" data-end=\"5045\">\n<p data-start=\"5009\" data-end=\"5045\">Professional <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> cleaning: \u20ac70\u2013150<\/p>\n<\/li>\n<li data-start=\"5046\" data-end=\"5081\">\n<p data-start=\"5048\" data-end=\"5081\">Aftermarket <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> valve: \u20ac220\u2013500<\/p>\n<\/li>\n<li data-start=\"5082\" data-end=\"5110\">\n<p data-start=\"5084\" data-end=\"5110\">OEM <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> valve: \u20ac500\u20131000<\/p>\n<\/li>\n<li data-start=\"5111\" data-end=\"5155\">\n<p data-start=\"5113\" data-end=\"5155\">Labor (complex access engines): \u20ac150\u2013400<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5157\" data-end=\"5204\">If ignored, long-term consequences may include:<\/p>\n<ul data-start=\"5206\" data-end=\"5315\">\n<li data-start=\"5206\" data-end=\"5248\">\n<p data-start=\"5208\" data-end=\"5248\">Premature <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-dpf-removal-the-whole-truth-and-real-risks\/\">DPF<\/a> replacement (\u20ac600\u20132000+)<\/p>\n<\/li>\n<li data-start=\"5249\" data-end=\"5274\">\n<p data-start=\"5251\" data-end=\"5274\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0234-code-turbo-overboost-engine-danger\/\">Turbo<\/a> efficiency loss<\/p>\n<\/li>\n<li data-start=\"5275\" data-end=\"5315\">\n<p data-start=\"5277\" data-end=\"5315\">Increased fuel consumption over time<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5317\" data-end=\"5361\">Early intervention is significantly cheaper.<\/p>\n<hr data-start=\"5363\" data-end=\"5366\" \/>\n<h2 data-start=\"5368\" data-end=\"5404\">Frequently Affected Diesel Brands<\/h2>\n<p data-start=\"5406\" data-end=\"5465\">The <strong data-start=\"5410\" data-end=\"5419\">P0402<\/strong> code is commonly seen in diesel engines from:<\/p>\n<ul data-start=\"5467\" data-end=\"5718\">\n<li data-start=\"5467\" data-end=\"5508\">\n<p data-start=\"5469\" data-end=\"5508\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Volkswagen<\/span><\/span><\/p>\n<\/li>\n<li data-start=\"5509\" data-end=\"5550\">\n<p data-start=\"5511\" data-end=\"5550\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/bmw-art-car-world-tour-expands-to-romania\/\">BMW<\/a><\/span><\/span><\/p>\n<\/li>\n<li data-start=\"5551\" data-end=\"5592\">\n<p data-start=\"5553\" data-end=\"5592\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/engines\/audi\/\">Audi<\/a><\/span><\/span><\/p>\n<\/li>\n<li data-start=\"5593\" data-end=\"5634\">\n<p data-start=\"5595\" data-end=\"5634\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Ford<\/span><\/span><\/p>\n<\/li>\n<li data-start=\"5635\" data-end=\"5676\">\n<p data-start=\"5637\" data-end=\"5676\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Renault<\/span><\/span><\/p>\n<\/li>\n<li data-start=\"5677\" data-end=\"5718\">\n<p data-start=\"5679\" data-end=\"5718\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Opel<\/span><\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5720\" data-end=\"5773\">Particularly on 1.6L, 2.0L and 3.0L diesel platforms.<\/p>\n<hr data-start=\"5775\" data-end=\"5778\" \/>\n<h2 data-start=\"5780\" data-end=\"5798\">Prevention Tips<\/h2>\n<p data-start=\"5800\" data-end=\"5832\">To reduce the risk of <strong data-start=\"5822\" data-end=\"5831\">P0402<\/strong>:<\/p>\n<ul data-start=\"5834\" data-end=\"6028\">\n<li data-start=\"5834\" data-end=\"5869\">\n<p data-start=\"5836\" data-end=\"5869\">Avoid constant short city trips<\/p>\n<\/li>\n<li data-start=\"5870\" data-end=\"5919\">\n<p data-start=\"5872\" data-end=\"5919\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%f0%9f%94%a7-car-drive-shafts-everything-you-need-to-know\/\">Drive<\/a> periodically at sustained highway speed<\/p>\n<\/li>\n<li data-start=\"5920\" data-end=\"5952\">\n<p data-start=\"5922\" data-end=\"5952\">Use high-quality diesel fuel<\/p>\n<\/li>\n<li data-start=\"5953\" data-end=\"5993\">\n<p data-start=\"5955\" data-end=\"5993\">Maintain proper oil change intervals<\/p>\n<\/li>\n<li data-start=\"5994\" data-end=\"6028\">\n<p data-start=\"5996\" data-end=\"6028\">Address minor <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> faults early<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"6030\" data-end=\"6033\" \/>\n<h2 data-start=\"6035\" data-end=\"6048\">Conclusion<\/h2>\n<p data-start=\"6050\" data-end=\"6225\"><strong data-start=\"6050\" data-end=\"6096\">P0402 is a serious diesel <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a> fault.<\/strong><br data-start=\"6096\" data-end=\"6099\" \/>Excessive <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-egr-cooler-role-how-it-works\/\">EGR<\/a> flow disrupts combustion balance and may trigger a cascade of related issues in the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/car-consumes-too-much-fuel-10-real-causes\/\">turbocharger<\/a> and <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-dpf-removal-the-whole-truth-and-real-risks\/\">DPF<\/a> system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0402 fault code signals that the Exhaust Gas Recirculation (EGR) system is flowing more exhaust gas than the engine control module (ECM) expects under current operating conditions. While EGR is essential for reducing NOx emissions, excessive recirculation disrupts the delicate balance between fresh intake air and exhaust gases. When P0402 is triggered, the engine [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":38712,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[45415],"tags":[36299,36339,44243,44274,44268,44253,44272,44276,44270,44278],"class_list":["post-38718","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-obd2-en","tag-bam","tag-diagnoza","tag-diesel-egr-problem","tag-diesel-power-loss","tag-egr-excessive-flow","tag-egr-repair-cost-2026","tag-egr-valve-stuck-open","tag-emission-fault-diesel","tag-obd2-p0402-code","tag-p0402"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>P0402 \u2013 EGR Excessive Flow? 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