Engine Exhaust Temperature Sensor 1 - Voltage Out of Range
The engine exhaust temperature sensor is reporting a voltage reading that is outside of the expected range.
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What it means (plain English)
The exhaust temperature sensor measures how hot the exhaust gases are, usually between 300°F and 1,200°F, and it's sending a signal that doesn't match what's expected, which could mean it's either faulty or there's a problem somewhere else.
What the computer is actually seeing
The temperature sensor usually outputs a voltage between 0.5V and 4.5V depending on the temperature. If it goes above 4.5V or below 0.5V, the computer flags a fault.
What a healthy reading looks like
0.5V to 4.5V corresponding to exhaust temperatures between approximately 300°F to 1,200°F.
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.
- 1Check for any visible damage to the exhaust temperature sensor wiring and connectors. Inspect for corrosion or loose connections.
- 2Measure the voltage at the exhaust temperature sensor connector with the ignition on (engine off). Expected value should be between 0.5V to 4.5V. If outside this range, proceed to step 3.
- 3Test the exhaust temperature sensor using a multimeter to check for resistance values according to specifications. If the sensor is faulty, replace it.
- 4If sensor tests good, check the exhaust system for any leaks or restrictions that could affect temperature readings.
Common causes
- Faulty exhaust temperature sensor
- Damaged wiring or connectors
- Short circuit in the sensor circuit
- Exhaust leaks affecting temperature measurement
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not an immediate safety hazard, but performance may be affected. Fix it soon.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed or if the sensor is faulty.
Why does it pair with other codes?
Common causes may affect the same system or sensor, leading to multiple fault codes being triggered.
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