P0098: Intake Air Temperature Sensor 2 Circuit High (Bank 1)
P0098 means the engine computer sees a signal from the second intake air temperature sensor that is above its valid range. It is usually a minor fault that turns on the check engine light with few noticeable symptoms, and it is often an easy repair.
You can drive, but get it checked soon
The data lists limp mode as unlikely and says the fault usually causes no noticeable symptoms, so short-term driving is generally acceptable. The computer may use a slightly wrong value for power or knock control (engine knocking protection), so have it checked soon rather than ignoring it. The code is emissions-relevant, so the light will stay on until it is fixed.
What it means
Intake air temperature sensor 2 is the second air temperature sensor in the intake path. On many turbocharged engines it sits in the intake manifold, often combined with the manifold pressure sensor. The engine control module (the main engine computer) uses its reading to work out how much air fills the cylinders and to set ignition timing. For P0098, the sensor signal is above its valid range. Most of these sensors are voltage-type NTC sensors (their electrical resistance drops as they warm up). On those, a high signal means an open circuit or a short to the reference voltage, and the computer reads an extremely low temperature. On sensors with a frequency output, a high signal corresponds to an extremely high temperature. Either way the reading is not believable, so the computer sets the code and turns on the check engine light.
Likely causes
- Connector loose or corroded, or wire interruptedVery likely
A poor connection or broken wire looks to the computer like an open circuit, which produces a high signal.
- Sensor open internallyPossible
If the sensing element inside has failed open, the signal goes out of range even when the wiring is fine.
- Sensor ground interruptedPossible
Without a good ground connection the sensor circuit cannot complete, and the signal reads high.
- Engine control module faultyLess likely
A fault inside the computer can misread the circuit, but this is the least common cause and should be considered only after the rest is ruled out.
What you may notice
- Check engine light on
- Usually no noticeable symptoms
- Slightly changed power or knock control with an implausible reading
What to check, cheapest first
- 1Read the code with a scan tool and note any related codes such as P0095, P0096, P0097 or P0099, then clear it and see if it returns. · you can do it
- 2Find the sensor (on many turbocharged engines it is in the intake manifold) and inspect its connector for looseness, corrosion, bent pins or damage. · you can do it
- 3Unplug and firmly reconnect the connector, and look along the visible wiring for chafing or breaks. · you can do it
- 4With a scan tool, watch the live intake air temperature 2 reading. An extremely low or implausible value that does not change points to an open circuit or sensor fault. · mechanic
- 5Test the sensor wiring and ground connection with a multimeter for continuity and correct reference voltage. · mechanic
- 6If wiring and ground are good, test or replace the sensor. Consider the engine control module only after everything else is ruled out. · mechanic
Frequently asked questions
Can I drive with a P0098 code?+
Usually yes for a short time, since there are normally no noticeable symptoms. Power or knock control may be slightly off, so get it checked soon.
Can a loose gas cap cause P0098?+
No. This code points to the sensor circuit, most often a loose or corroded connector or a broken wire. A gas cap fault sets different codes.
Will P0098 pass an emissions test?+
Probably not. The code is emissions-relevant and keeps the check engine light on. After the repair, a drive cycle (a set pattern of driving that lets the computer re-run its self-tests) is required before the system is ready for testing.
How hard is it to fix?+
It is rated easy and can be a do-it-yourself job. The estimated time is about 0.3 to 2 hours, depending on whether it is only a connector or a part needs replacing.
Written with the help of AI from the public OBDex definition (CC0). Each make may use the code differently. Updated: 2026-11-10