Exhaust Gas Temperature Sensor Circuit Range/Performance Problem - Bank 1
The exhaust gas temperature sensor reading is out of expected range on bank 1.
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What it means (plain English)
There's a sensor that measures how hot the exhaust gases are coming from bank 1 of the engine, and it’s showing a temperature that doesn’t make sense, either too high or too low than what the system expects.
What the computer is actually seeing
The engine control module expects the exhaust gas temperature sensor to read between 300°F to 1600°F (approx. 150°C to 870°C) during normal operation. If the reading is outside this range consistently, it triggers this code.
What a healthy reading looks like
Normal exhaust gas temperature readings should be between 300°F to 1600°F when the engine is running.
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 the exhaust gas temperature sensor wiring and connectors for damage or corrosion.
- 2Measure the resistance of the exhaust gas temperature sensor; it should typically show a resistance value in the range of 5-10 ohms at room temperature.
- 3Use a scan tool to monitor the EGT reading while the engine is running; compare with expected values. If readings are outside the range of 300°F to 1600°F, replace the sensor.
- 4Inspect for any exhaust leaks upstream of the sensor, which could cause false readings.
Common causes
- Failed exhaust gas temperature sensor
- Wiring issues (shorts, open circuits)
- Poor connections or corrosion at the sensor plug
- Exhaust leaks causing incorrect temperature readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with a P208C code?
It's moderate severity; you can drive it but should fix it soon to avoid potential damage or excessive emissions.
Will the P208C code come back after I clear it?
If there is a persistent issue (bad sensor, wiring problem), the code will likely return.
Why does this code pair with other EGT codes?
EGT codes can be interconnected; if one sensor fails or circuit has issues, it can trigger multiple related codes.
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