P0110 + P0120 – Intake & Throttle Fault?

[caption id="attachment_38750" align="aligncenter" width="1000"] How to Replace an Intake Air Temperature Sensor Diagram indicating the intake air temperature sensor[/caption] When P0110 + P0120 appear together, the issue typically affects air intake temperature measurement and throttle position monitoring. These two sensors directly influence fuel injection calculations and throttle response. Incorrect signals can trigger limp mode and unstable engine behavior. Understanding P0110 + P0120 helps avoid unnecessary throttle body replacement. P0110 – Intake Air Temperature Circuit The IAT sensor measures incoming air temperature. The ECU adjusts fuel mixture density accordingly. Fault triggers include: Open circuit Short to ground Implausible temperature reading P0120 – Throttle Position Circuit The throttle position sensor monitors throttle plate angle. Common triggers: Signal interruption Voltage mismatch Mechanical throttle contamination Professional Diagnostic Procedure Check 5V reference supply Verify ground continuity Monitor live data voltage output Perform throttle relearn procedure Inspect intake contamination Advanced diagnostic tutorials:https://diagnozabam.ro Engineering reference:https://www.sae.org Estimated Repair Costs (EU) IAT sensor: €20–€70 Throttle cleaning: €30–€80 Complete throttle body: €150–€400 Wiring repair: €30–€100 Final Verdict The combination of P0110 + P0120 signals intake and throttle control disruption. In many cases, electrical faults or contamination are responsible — not catastrophic engine damage. Systematic diagnosis ensures accurate repair and prevents unnecessary expenses.