P0098: Intake Air Temperature Sensor 2 Circuit High Bank 1

What it means

The Intake Air Temperature Sensor 2 circuit signal for Bank 1 is higher than expected.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

Intake Air Temperature Sensor 2 measures intake-air temperature at a second sensing point, whose location depends on the vehicle. The control module sets P0098 when the Sensor 2 signal is higher than expected, often because of an open signal circuit or a short to a powered wire.

Common causes

Most likely first.

1. Signal wire open
2. Connector pins corroded - high contact resistance
3. Supply wire pinched against B+ source

Symptoms

• Check engine light on
• Poor fuel economy
• Rough idle or hesitation
• Hard starting in some conditions

How to diagnose it

1. Review freeze-frame and live Sensor 2 data to confirm the signal is implausibly high and note the conditions when it occurred.
2. Inspect the Sensor 2 connector and harness for an unplugged connection, broken signal wire, corrosion, or insulation contacting a power source.
3. Check terminal seating and connector condition, especially for a loose or corroded signal contact.
4. Use the wiring diagram to test the Sensor 2 signal circuit for opens or shorts to power and compare results with the manufacturer's specification.
5. If wiring checks pass, test Intake Air Temperature Sensor 2 and its circuit before considering a module fault.

Common fixes

• Reconnect a loose Sensor 2 connector or repair an open signal wire.
• Repair wiring shorted to a power source.
• Clean or replace corroded or damaged terminals.
• Replace Intake Air Temperature Sensor 2 if testing confirms it is faulty.

Can I keep driving?

You can generally continue driving if the engine runs normally, but the incorrect intake-temperature signal may affect fuel economy or cause hesitation. Avoid high-demand trips if the engine starts poorly or runs rough.