Exhaust Gas Temperature Sensor 1 Circuit High
The exhaust gas temperature sensor signal is too high.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are coming out of the engine. If the sensor reports a temperature that's too high, it might cause issues with performance and emissions.
What the computer is actually seeing
The engine control unit (ECU) reads the exhaust gas temperature sensor voltage as being above the expected range, typically over 1.5 volts which indicates a fault condition or a malfunctioning sensor.
What a healthy reading looks like
Expected voltage should range between 0.5 and 1.5 volts. Anything above this indicates potential sensor failure or circuit issue.
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 wiring and connectors for damage or corrosion, especially near the sensor. If any damage is found, repair it.
- 22. Check the exhaust gas temperature sensor resistance with a multimeter. It should be within the specified range (generally between 1 to 5 ohms at room temperature). If it's out of range, replace the sensor.
- 33. Ensure there are no exhaust leaks before the sensor that could skew readings. Check for leaks visually or using a smoke test.
- 44. If the wiring and sensor are good, use a scan tool to see if there are any other related fault codes that could indicate a deeper issue.
- 55. Clear the codes and perform a test drive to see if SPN 2728 returns. If it does, replacing the sensor is likely necessary.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues (short circuit, open circuit)
- Corrosion at connectors
- Exhaust system leaks affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive, but performance might be affected and emissions could increase. It's best to fix it soon.
Will this issue come back after clearing the code?
If the underlying issue isn't addressed, yes, the code is likely to come back.
Does this code always pair with others?
It can, especially with related exhaust temperature codes depending on the failure scenario.
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