Faulty Exhaust Gas Temperature Sensor
This code indicates a problem with the exhaust gas temperature sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust gas temperature sensor measures how hot the gases are in the exhaust system. If it sees a temperature too high or too low, it triggers this code. The sensor typically operates between 0.5V (cold) and 4.5V (hot).
What the computer is actually seeing
The engine control module (ECM) monitors the voltage signal from the exhaust temperature sensor. A reading consistently outside the range of 0.5V to 4.5V will cause this fault code.
What a healthy reading looks like
Normal exhaust gas temperatures are typically between 300°C and 800°C (572°F - 1472°F) depending on engine load and operation.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connector to the exhaust gas temperature sensor for damage or corrosion. If damaged, repair or replace as needed. Decision: If wiring and connector are good, move to step 2.
- 22. Measure the voltage at the exhaust gas temperature sensor connector with the engine at operating temperature. A normal reading should be 0.5V to 4.5V. Decision: If voltage is within range, the sensor is likely good. If out of range, move to step 3.
- 33. Swap out the exhaust gas temperature sensor with a known good sensor. Decision: If the code clears after replacement, the sensor was faulty. If the code returns, further investigation into the ECM may be needed.
Common causes
- Damaged or shorted wiring to the temperature sensor
- Faulty exhaust gas temperature sensor
- Poor connector contact
- Exhaust system leaks affecting temperature readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but the vehicle may experience reduced performance or increased emissions.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why is this code linked to performance issues?
This sensor helps regulate engine functions, and if it's faulty, it can lead to incorrect adjustments in air-fuel ratios.
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