{"id":39749,"date":"2026-03-24T10:58:55","date_gmt":"2026-03-24T08:58:55","guid":{"rendered":"https:\/\/diagnozabam.ro\/sfaturi\/?p=39749"},"modified":"2026-03-24T10:58:55","modified_gmt":"2026-03-24T08:58:55","slug":"p0135-code-o2-sensor-heater-circuit-malfunction","status":"publish","type":"post","link":"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0135-code-o2-sensor-heater-circuit-malfunction\/","title":{"rendered":"P0135 Code \u2013 O2 Sensor Heater Circuit Malfunction"},"content":{"rendered":"<p data-start=\"402\" data-end=\"530\">The <strong data-start=\"406\" data-end=\"445\">P0135 diagnostic trouble code (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0205-code-injector-circuit-malfunction-cylinder-5\/\">DTC<\/a>)<\/strong> indicates a malfunction in the <strong data-start=\"477\" data-end=\"529\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> heater circuit for Bank 1 Sensor 1<\/strong>.<\/p>\n<p data-start=\"532\" data-end=\"739\">Modern vehicles use <strong data-start=\"552\" data-end=\"584\">heated oxygen sensors (HO2S)<\/strong> to monitor <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gases and control the air-fuel mixture. The heater element allows the sensor to reach operating temperature quickly after engine start.<\/p>\n<p data-start=\"741\" data-end=\"921\">When the <strong data-start=\"750\" data-end=\"779\">Engine Control Unit (ECU)<\/strong> detects a problem in the heater circuit of the upstream <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a>, it stores the <strong data-start=\"865\" data-end=\"879\">P0135 code<\/strong> and activates the <strong data-start=\"898\" data-end=\"920\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/%e2%9a%99%ef%b8%8f-faulty-maf-sensor-symptoms-causes-fixes\/\">Check Engine<\/a> Light<\/strong>.<\/p>\n<hr data-start=\"923\" data-end=\"926\" \/>\n<h2 data-section-id=\"ajbzd2\" data-start=\"928\" data-end=\"953\">What Is Bank 1 Sensor 1<\/h2>\n<p data-start=\"955\" data-end=\"1003\">Oxygen sensors are placed in the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> system.<\/p>\n<ul data-start=\"1005\" data-end=\"1156\">\n<li data-section-id=\"16lmuh5\" data-start=\"1005\" data-end=\"1069\">\n<p data-start=\"1007\" data-end=\"1069\"><strong data-start=\"1007\" data-end=\"1017\">Bank 1<\/strong> \u2013 the side of the engine that contains cylinder 1<\/p>\n<\/li>\n<li data-section-id=\"ghbvfk\" data-start=\"1070\" data-end=\"1156\">\n<p data-start=\"1072\" data-end=\"1156\"><strong data-start=\"1072\" data-end=\"1084\">Sensor 1<\/strong> \u2013 the upstream <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> located <strong data-start=\"1122\" data-end=\"1156\">before the catalytic converter<\/strong><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1158\" data-end=\"1283\">This sensor measures oxygen levels in <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> gases and helps the ECU adjust the <strong data-start=\"1239\" data-end=\"1257\">air-fuel ratio<\/strong> for efficient combustion.<\/p>\n<hr data-start=\"1285\" data-end=\"1288\" \/>\n<h2 data-section-id=\"4tuhdf\" data-start=\"1290\" data-end=\"1323\">Common Causes of the P0135 Code<\/h2>\n<p data-start=\"1325\" data-end=\"1367\">Several issues may trigger the P0135 code.<\/p>\n<h3 data-section-id=\"xm6sfi\" data-start=\"1369\" data-end=\"1400\">Faulty oxygen sensor heater<\/h3>\n<p data-start=\"1401\" data-end=\"1450\">The heater element inside the O2 sensor may fail.<\/p>\n<h3 data-section-id=\"9b313c\" data-start=\"1452\" data-end=\"1484\">Damaged wiring or connectors<\/h3>\n<p data-start=\"1485\" data-end=\"1562\">Broken wires, corrosion or loose connectors may interrupt the heater circuit.<\/p>\n<h3 data-section-id=\"9434hn\" data-start=\"1564\" data-end=\"1578\">Blown fuse<\/h3>\n<p data-start=\"1579\" data-end=\"1646\">Some vehicles protect the heater circuit with a fuse that may fail.<\/p>\n<h3 data-section-id=\"uwnaj4\" data-start=\"1648\" data-end=\"1665\">Exhaust leaks<\/h3>\n<p data-start=\"1666\" data-end=\"1722\">Leaks near the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> may affect sensor readings.<\/p>\n<h3 data-section-id=\"goq6ze\" data-start=\"1724\" data-end=\"1745\">ECU issues (rare)<\/h3>\n<p data-start=\"1746\" data-end=\"1834\">In rare cases, the engine control unit may fail to control the heater circuit correctly.<\/p>\n<hr data-start=\"1836\" data-end=\"1839\" \/>\n<h2 data-section-id=\"1vwgsji\" data-start=\"1841\" data-end=\"1869\">Symptoms of the P0135 Code<\/h2>\n<p data-start=\"1871\" data-end=\"1907\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/pc-freezes-randomly-causes-and-fix\/\">Drivers<\/a> may notice several symptoms.<\/p>\n<p data-start=\"1909\" data-end=\"1930\">Common signs include:<\/p>\n<ul data-start=\"1932\" data-end=\"2082\">\n<li data-section-id=\"whrhy6\" data-start=\"1932\" data-end=\"1954\">\n<p data-start=\"1934\" data-end=\"1954\"><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<li data-section-id=\"17lk8g1\" data-start=\"1955\" data-end=\"1982\">\n<p data-start=\"1957\" data-end=\"1982\">reduced fuel efficiency<\/p>\n<\/li>\n<li data-section-id=\"1rfyrsv\" data-start=\"1983\" data-end=\"2011\">\n<p data-start=\"1985\" data-end=\"2011\">rough idle in some cases<\/p>\n<\/li>\n<li data-section-id=\"17pfn53\" data-start=\"2012\" data-end=\"2037\">\n<p data-start=\"2014\" data-end=\"2037\">failed <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a> test<\/p>\n<\/li>\n<li data-section-id=\"y48lm8\" data-start=\"2038\" data-end=\"2082\">\n<p data-start=\"2040\" data-end=\"2082\">longer time to reach closed-loop operation<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2084\" data-end=\"2128\">In most cases, the vehicle remains drivable.<\/p>\n<hr data-start=\"2130\" data-end=\"2133\" \/>\n<h2 data-section-id=\"15urs5i\" data-start=\"2135\" data-end=\"2158\">How to Diagnose P0135<\/h2>\n<p data-start=\"2160\" data-end=\"2200\">Proper diagnosis requires several steps.<\/p>\n<h3 data-section-id=\"13znv0o\" data-start=\"2202\" data-end=\"2231\">Step 1 \u2013 Scan the vehicle<\/h3>\n<p data-start=\"2232\" data-end=\"2331\">Confirm the <strong data-start=\"2244\" data-end=\"2258\">P0135 code<\/strong> using an <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0229-code-throttle-pedal-position-sensor-c-intermittent\/\">OBD2<\/a> scanner and check for related <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/obd2-winter-codes-what-they-mean-and-why-they-appear\/\">codes<\/a> such as:<\/p>\n<ul data-start=\"2333\" data-end=\"2370\">\n<li data-section-id=\"1sx3tui\" data-start=\"2333\" data-end=\"2342\">\n<p data-start=\"2335\" data-end=\"2342\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0130-code-o2-sensor-circuit-malfunction-bank-1-sensor-1\/\">P0130<\/a><\/p>\n<\/li>\n<li data-section-id=\"1sx3t23\" data-start=\"2343\" data-end=\"2352\">\n<p data-start=\"2345\" data-end=\"2352\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0131-code-o2-sensor-circuit-low-voltage\/\">P0131<\/a><\/p>\n<\/li>\n<li data-section-id=\"1sx3s60\" data-start=\"2353\" data-end=\"2362\">\n<p data-start=\"2355\" data-end=\"2362\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0132-code-o2-sensor-circuit-high-voltage\/\">P0132<\/a><\/p>\n<\/li>\n<li data-section-id=\"1769ce4\" data-start=\"2363\" data-end=\"2370\">\n<p data-start=\"2365\" data-end=\"2370\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0141-code-o2-sensor-heater-circuit-malfunction\/\">P0141<\/a><\/p>\n<\/li>\n<\/ul>\n<h3 data-section-id=\"8nldpq\" data-start=\"2372\" data-end=\"2410\">Step 2 \u2013 Inspect the oxygen sensor<\/h3>\n<p data-start=\"2411\" data-end=\"2486\">Check the <strong data-start=\"2421\" data-end=\"2440\">Bank 1 Sensor 1<\/strong> connector and wiring for damage or corrosion.<\/p>\n<h3 data-section-id=\"77q18u\" data-start=\"2488\" data-end=\"2523\">Step 3 \u2013 Test heater resistance<\/h3>\n<p data-start=\"2524\" data-end=\"2589\">Using a multimeter, measure the resistance of the heater element.<\/p>\n<h3 data-section-id=\"bndm3d\" data-start=\"2591\" data-end=\"2622\">Step 4 \u2013 Check power supply<\/h3>\n<p data-start=\"2623\" data-end=\"2692\">Verify that the heater circuit receives power from the fuse or relay.<\/p>\n<hr data-start=\"2694\" data-end=\"2697\" \/>\n<h2 data-section-id=\"19740d9\" data-start=\"2699\" data-end=\"2727\">Repair Solutions for P0135<\/h2>\n<p data-start=\"2729\" data-end=\"2762\">Typical repair solutions include:<\/p>\n<ul data-start=\"2764\" data-end=\"2877\">\n<li data-section-id=\"yl7a7g\" data-start=\"2764\" data-end=\"2795\">\n<p data-start=\"2766\" data-end=\"2795\">replacing the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a><\/p>\n<\/li>\n<li data-section-id=\"bedut2\" data-start=\"2796\" data-end=\"2824\">\n<p data-start=\"2798\" data-end=\"2824\">repairing damaged wiring<\/p>\n<\/li>\n<li data-section-id=\"1nyp0jh\" data-start=\"2825\" data-end=\"2851\">\n<p data-start=\"2827\" data-end=\"2851\">replacing a blown fuse<\/p>\n<\/li>\n<li data-section-id=\"8olygz\" data-start=\"2852\" data-end=\"2877\">\n<p data-start=\"2854\" data-end=\"2877\">repairing <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/exhaust-smoke-colors\/\">exhaust<\/a> leaks<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2879\" data-end=\"2947\">Most cases are resolved by <strong data-start=\"2906\" data-end=\"2946\">replacing the upstream <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a><\/strong>.<\/p>\n<hr data-start=\"2949\" data-end=\"2952\" \/>\n<h2 data-section-id=\"1w7oyxu\" data-start=\"2954\" data-end=\"2977\">Estimated Repair Cost<\/h2>\n<p data-start=\"2979\" data-end=\"3008\">Typical repair costs include:<\/p>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3010\" data-end=\"3155\">\n<thead data-start=\"3010\" data-end=\"3037\">\n<tr data-start=\"3010\" data-end=\"3037\">\n<th class=\"\" data-start=\"3010\" data-end=\"3019\" data-col-size=\"sm\">Repair<\/th>\n<th class=\"\" data-start=\"3019\" data-end=\"3037\" data-col-size=\"sm\">Estimated Cost<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3054\" data-end=\"3155\">\n<tr data-start=\"3054\" data-end=\"3095\">\n<td data-start=\"3054\" data-end=\"3080\" data-col-size=\"sm\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">Oxygen sensor<\/a> replacement<\/td>\n<td data-start=\"3080\" data-end=\"3095\" data-col-size=\"sm\">$120 \u2013 $350<\/td>\n<\/tr>\n<tr data-start=\"3096\" data-end=\"3124\">\n<td data-start=\"3096\" data-end=\"3110\" data-col-size=\"sm\">Wiring repair<\/td>\n<td data-start=\"3110\" data-end=\"3124\" data-col-size=\"sm\">$80 \u2013 $250<\/td>\n<\/tr>\n<tr data-start=\"3125\" data-end=\"3155\">\n<td data-start=\"3125\" data-end=\"3142\" data-col-size=\"sm\">Fuse replacement<\/td>\n<td data-start=\"3142\" data-end=\"3155\" data-col-size=\"sm\">$10 \u2013 $50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"3157\" data-end=\"3160\" \/>\n<h2 data-section-id=\"i7dd31\" data-start=\"3162\" data-end=\"3193\">Can You Drive With Code P0135<\/h2>\n<p data-start=\"3195\" data-end=\"3279\">Driving with <strong data-start=\"3208\" data-end=\"3217\">P0135<\/strong> is possible, but it may affect fuel efficiency and <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a>.<\/p>\n<p data-start=\"3281\" data-end=\"3312\">Ignoring the issue may lead to:<\/p>\n<ul data-start=\"3314\" data-end=\"3396\">\n<li data-section-id=\"mqwbbr\" data-start=\"3314\" data-end=\"3344\">\n<p data-start=\"3316\" data-end=\"3344\">increased fuel consumption<\/p>\n<\/li>\n<li data-section-id=\"deyh1n\" data-start=\"3345\" data-end=\"3365\">\n<p data-start=\"3347\" data-end=\"3365\">higher <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a><\/p>\n<\/li>\n<li data-section-id=\"112na3g\" data-start=\"3366\" data-end=\"3396\">\n<p data-start=\"3368\" data-end=\"3396\">failed <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a> inspections<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3398\" data-end=\"3445\">It is recommended to repair the issue promptly.<\/p>\n<hr data-start=\"3447\" data-end=\"3450\" \/>\n<h2 data-section-id=\"psttll\" data-start=\"3452\" data-end=\"3470\">FAQ \u2013 P0135 Code<\/h2>\n<h3 data-section-id=\"q131vl\" data-start=\"3472\" data-end=\"3496\">What does P0135 mean<\/h3>\n<p data-start=\"3497\" data-end=\"3598\">The <strong data-start=\"3501\" data-end=\"3515\">P0135 code<\/strong> indicates a malfunction in the <strong data-start=\"3547\" data-end=\"3597\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> heater circuit (Bank 1 Sensor 1)<\/strong>.<\/p>\n<h3 data-section-id=\"15pmy7l\" data-start=\"3600\" data-end=\"3635\">Can a bad O2 sensor cause P0135<\/h3>\n<p data-start=\"3636\" data-end=\"3715\">Yes. A faulty heater element inside the <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> is the most common cause.<\/p>\n<h3 data-section-id=\"148wj5b\" data-start=\"3717\" data-end=\"3737\">Is P0135 serious<\/h3>\n<p data-start=\"3738\" data-end=\"3823\">It is usually <strong data-start=\"3752\" data-end=\"3774\">moderately serious<\/strong>, mainly affecting <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/wet-vs-dry-timing-belt-what-drivers-must-know\/\">emissions<\/a> and fuel efficiency.<\/p>\n<h3 data-section-id=\"7ikbvi\" data-start=\"3825\" data-end=\"3849\">How do you fix P0135<\/h3>\n<p data-start=\"3850\" data-end=\"3928\">Start by checking the <strong data-start=\"3872\" data-end=\"3927\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0134-code-o2-sensor-circuit-no-activity-detected\/\">oxygen sensor<\/a> heater circuit and wiring connections<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0135 diagnostic trouble code (DTC) indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 1. Modern vehicles use heated oxygen sensors (HO2S) to monitor exhaust gases and control the air-fuel mixture. The heater element allows the sensor to reach operating temperature quickly after engine start. When the Engine Control Unit [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10039,"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":[36299,36841,36339,45999,46001,45463,46003,46005],"class_list":["post-39749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-obd2-en","tag-bam","tag-car-diagnostics","tag-diagnoza","tag-engine-codes","tag-obd2","tag-obd2-code","tag-p0135","tag-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.6) - 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