Faulty intake air temperature sensor 2 (internal open circuit); Unplugged, corroded or loose connector at the sensor; Open circuit in the signal or ground wire between sensor and control unit; Signal wire shorted to a voltage supply; Damaged wiring harness from heat, chafing or rodent damage; Fault in the engine control unit.

P0098

Intake Air Temperature Sensor 2 Circuit High Bank 1.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
98: FaultThe specific fault in that area

What it means

P0098 means the engine control unit has detected the signal voltage from intake air temperature sensor 2 on bank 1 is higher than expected, which points to an open circuit, a short to voltage or a faulty sensor. The control unit reads the signal as an extremely low air temperature, so it may use a substitute value. The location of sensor 2 varies by engine, for example after a turbocharger or charge air cooler, so check the model-specific layout.

Symptoms

Engine warning light on
Poor performance or reduced power
Rough running or hesitation, especially when cold
Hard starting or poor cold running
Increased fuel consumption
Possible black smoke or rich running

Possible causes

Faulty intake air temperature sensor 2 (internal open circuit)likely
Unplugged, corroded or loose connector at the sensorlikely
Open circuit in the signal or ground wire between sensor and control unitlikely
Signal wire shorted to a voltage supplypossible
Damaged wiring harness from heat, chafing or rodent damagepossible
Fault in the engine control unitrare

How to diagnose

Read all stored and pending codes and note freeze frame data, including engine temperature and conditions when the fault set.
Check live data for intake air temperature sensor 2 and compare it with sensor 1 and ambient temperature on a cold engine; a reading stuck at an extreme low value suggests an open circuit.
Locate sensor 2 using model-specific information and inspect the sensor, connector and nearby wiring for damage, heat marks, corrosion or poor locking.
Unplug the sensor, check the terminals for corrosion or spread pins, and refit it firmly.
With the ignition off and connector unplugged, measure the sensor resistance and compare it with the manufacturer's temperature-resistance specification.
With the ignition on and sensor unplugged, check the reference supply and ground at the connector, and check that the signal voltage is not above the specified level.
Test the signal and ground wires for continuity to the control unit, and for shorts to voltage or each other, wiggling the harness while monitoring live data.
Only if the wiring and sensor test correctly, investigate the control unit following manufacturer procedures.

How to fix

Replace intake air temperature sensor 2 if its resistance is out of specification or it gives an implausible reading.
Clean, repair or replace the corroded or damaged connector and terminals.
Repair or replace open-circuit or damaged wiring in the signal or ground lead.
Repair any short to voltage in the harness and secure it away from heat and abrasion.
Once repairs are complete, clear the code and road test to confirm it does not return.

Can I keep driving?

Low severity

The car can usually be driven carefully for a short time, but book a repair soon as the engine may run poorly and use more fuel. If the car is running very roughly or losing power, limit driving.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.