Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Function test
- Connect diagnostic tester. Refer to Diagnostic tester, connecting .
- Switch ignition on.
- Under address word 33, select "Diagnostic mode 1: Checking measured values."
- Select measuring value "PID 15: Intake air temperature".
- Check specified value of intake air temperature:
| PID | Diagnostic text | Specified value: | ||||
| 15: | Intake Air Temperature (IAT) | approx. ambient temperature1) | ||||
1) If a temperature is indicated which is below ambient temperature of sensor, first check sensor wires for contact resistance. Note that while the vehicle is standing still the sensor might warm up due to radiant heat.
If a substitute value of approx. 134 ° C is displayed:
- Check resistance at sensor. Refer to Checking resistance at sensor .
If specified value is not obtained:
- Check sensor. Refer to Checking sensor .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.