Exhaust Gas Temperature Sensor 1 Circuit Low
There's a low reading from the exhaust gas temperature sensor 1 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 exhaust gases are. If the value drops too low, it suggests the sensor might be malfunctioning or shorted.
What the computer is actually seeing
The ECU monitors the voltage from the exhaust gas temperature sensor. A reading significantly below normal indicates a problem, triggering the fault code.
What a healthy reading looks like
Normal operating voltage for the sensor should be between 0.5V and 4.5V, depending on the exhaust temperature.
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. Check the wiring and connector to the exhaust gas temperature sensor for damage or loose connections. Is the wiring intact? Yes: go to step 2. No: repair the wiring/connector and retest.
- 22. Measure the voltage at the sensor connector with the ignition on (engine off). Is the voltage within the expected range (0.5V to 4.5V)? Yes: replace the sensor. No: check for open/short circuits in the wiring harness.
- 33. Inspect the exhaust system for leaks around the sensor location. Are there any exhaust leaks? Yes: repair the exhaust. No: replace the exhaust gas temperature sensor.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or short circuits in the sensor circuit
- Corrosion or damage at the connector
- Exhaust leaks affecting sensor operation
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, it's drivable but may affect performance and emissions, so get it fixed soon.
Will the code come back after clearing it?
If the underlying issue isn't fixed, then yes, it will likely return.
Why does this code sometimes appear with other codes?
It can indicate broader issues with the exhaust system or other sensors related to emissions.
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