Fuel and air

P0098 — Intake Air Temperature Sensor 2 Circuit High, Bank 1

Severity: low Safe to drive

What P0098 means

The engine control module supplies intake air temperature sensor 2 with a 5 V reference and reads the voltage drop to work out air temperature. Colder air raises the sensor's resistance and the signal voltage. P0098 sets when that signal voltage is abnormally high, which the ECM reads as extremely cold air. The usual culprits are an open circuit, a poor connection or a failed sensor.

Symptoms

  • Check Engine Light on
  • Rough idle
  • Hesitation or stumbling on acceleration
  • Reduced fuel economy
  • Hard starting when hot or very cold
  • Erratic engine performance

Possible causes

  1. Failed intake air temperature sensor 2
  2. Open signal or ground wire in the sensor circuit
  3. Signal wire shorted to voltage
  4. Corroded, loose or damaged connector terminals
  5. Damaged wiring harness near hot or moving parts
  6. Rarely, a faulty ECM

How to diagnose

  1. Scan for codes and freeze-frame data, and look for other air temperature or pressure sensor codes
  2. Check the IAT 2 live data: on a cold engine it should be close to ambient temperature, not stuck at a minimum such as −40 °F/°C
  3. Inspect the sensor connector and harness for corrosion, moisture, pushed-out pins and chafed insulation
  4. Unplug the sensor and jumper the two connector terminals: the reading should swing to a very high temperature, which shows the circuit back to the ECM works
  5. Use a multimeter to check for 5 V reference and a good ground at the connector
  6. Test the signal wire to the ECM for opens and for shorts to voltage
  7. Measure the sensor's resistance and compare it with the spec for your vehicle at a known temperature
  8. If the wiring and sensor are good, test the ECM before replacing it

Common fixes

  • Replace intake air temperature sensor 2
  • Repair the open or damaged section of wiring
  • Clean or replace the connector and terminals
  • Repair or replace the ECM (rare)

Questions and answers

What does P0098 mean?

The ECM is getting too high a signal voltage from intake air temperature sensor 2 on bank 1. It is most often an open circuit, a bad connection or a failed sensor.

Can I drive with a P0098 code?

Usually yes for short trips. The air-fuel mixture is calculated with bad data, so you may notice hesitation and poor fuel economy, so don't put off the repair.

How do I clear P0098?

Fix the cause first by checking the connector, wiring and sensor. Then clear the code with a scan tool; if the fault is still there, it will come back.

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.