Exhaust Gas Temperature Sensor 2 Circuit Low
Issues with the circuit of the second exhaust gas temperature sensor.
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What it means (plain English)
The computer thinks the temperature sensor that's supposed to measure how hot the exhaust is running is sending back a signal that says it's too low, possibly because of a bad sensor or wiring issue.
What the computer is actually seeing
The exhaust gas temperature sensor 2 is probably reading a voltage of less than 0.1V when it should be higher, typically around 0.5V to 4.5V depending on exhaust temperature.
What a healthy reading looks like
Exhaust gas temperature sensor 2 should report values between 0.5V (cold) to 4.5V (hot), corresponding to exhaust temperatures from 100°F (38°C) to over 1,500°F (815°C).
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 at the exhaust gas temperature sensor 2. Look for corrosion, looseness, or broken wires.
- 22. Measure the voltage at the sensor connector with the ignition on (engine off). You should see between 0.5V and 4.5V. If it's below 0.1V, proceed to step 3.
- 33. Disconnect the sensor and check for continuity from the connector back to the ECM. If you have an open circuit, repair the affected wiring.
- 44. If wiring is good, replace the exhaust gas temperature sensor 2 and retest.
- 55. Clear the fault codes and monitor the system for reoccurrence.
Common causes
- Faulty exhaust gas temperature sensor
- Open or short in wiring to the sensor
- Poor connection in the harness or connector
- Exhaust leaks before the sensor
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's manageable to drive but fix soon to avoid possible damage to the exhaust system.
Will this code come back after clearing it?
If the underlying issue isn't repaired, yes, it'll come back.
How does this affect emissions?
It can lead to improper exhaust readings, which may impact the emissions system's performance.
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