Fuel and air

P00E8 — Intake Air Temperature Sensor 3 Circuit Fault (Bank 1)

Severity: medium Drive with care, to a shop

What P00E8 means

The engine control module monitors the signal from an additional intake air temperature sensor (sensor 3, bank 1). The sensor changes resistance with temperature, and the ECM uses that to estimate air density for fuel and spark calculations. P00E8 sets when the signal is out of range, missing, or does not agree with other temperature readings.

Symptoms

  • Check Engine light on
  • Higher fuel consumption
  • Rough or uneven running, unstable idle
  • Reduced power and response
  • Hard or slow starting, especially when cold

Possible causes

  1. Failed intake air temperature sensor 3 (bank 1)
  2. Open, chafed or shorted wiring in the sensor circuit
  3. Corroded or loose connector terminals
  4. Intake air leak or contamination affecting readings
  5. Faulty ECM (rare)

How to diagnose

  1. Read all codes and freeze frame data, and note any other air temperature or boost sensor codes.
  2. Inspect the sensor, connector and harness for rubbing, heat damage, moisture or corrosion.
  3. With a cold engine, compare the scan tool reading with ambient temperature and the other IAT sensors.
  4. Measure sensor resistance and compare it to the manufacturer's spec at a known temperature.
  5. Check reference voltage, signal and ground at the connector, and test the harness to the ECM for opens and shorts.
  6. Inspect the intake tract for leaks or contamination near the sensor.
  7. If sensor and wiring are good, check the ECM and software updates.

Common fixes

  • Replace intake air temperature sensor 3
  • Repair the harness or replace the damaged connector, clean terminals
  • Fix intake air leaks
  • Reflash or repair the ECM if confirmed as the cause

Questions and answers

What does P00E8 mean?

It is a circuit fault in intake air temperature sensor 3 on bank 1. The ECM sees an implausible or missing signal and can't calculate the air/fuel mixture accurately.

Can I drive with P00E8?

For a short time usually yes, but you may see poor fuel economy and rough running. Have it diagnosed soon.

How do I clear P00E8?

Fix the cause first: the sensor, connector or wiring. Then clear the code with a scan tool; if the fault remains, it will return.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.