Inlet Manifold Temperature Sensor
The inlet manifold temperature sensor is reading out of range.
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What it means (plain English)
The inlet manifold temperature sensor measures the temperature of air entering the engine. If the reading is too high or too low, the engine control unit (ECU) thinks there's an issue with how the engine is processing air.
What the computer is actually seeing
The ECU expects the inlet manifold temperature to be within a specific range, typically between 30°C and 100°C (86°F to 212°F). If the sensor reads below -40°C or above 140°C (-40°F to 284°F), it sets this fault code.
What a healthy reading looks like
Inlet manifold temperature should be roughly equal to ambient temperature or slightly higher under load, depending on the engine operation.
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 for loose or corroded connectors at the inlet manifold temperature sensor. Repair or secure as necessary. Decision: Is the connection good? Yes - proceed to step 2. No - repair connection and retest.
- 22. Using a scan tool, monitor the inlet manifold temperature sensor reading. Does it align with the actual temperature of the manifold? Yes - proceed to step 3. No - sensor is likely faulty, replace it and retest.
- 33. Inspect the wiring for any visible damage or shorts. Are the wires intact? Yes - retest sensor. No - repair the wiring and retest.
Common causes
- Faulty inlet manifold temperature sensor
- Wiring issues or damaged connectors
- ECU programming error or malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances without repairing; performance may be affected.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, the code is likely to return.
Why does this code sometimes pair with SPN 2659?
SPN 2659 indicates a fault in the air intake system, which can affect manifold temperature readings.
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