Intake air temperature sensor 3 is a third air temperature sensor in the intake path. On documented turbocharged engines with a humidity sensor it is the manifold temperature sensor behind the charge air cooler, an NTC thermistor read directly by the engine control module and used for cylinder filling and ignition timing. The numbering of intake air temperature sensors differs between manufacturers. P00E9: This is a plausibility check once per ignition cycle after a long standstill (eight hours in a documented case): if the other intake temperature sensors agree and this sensor deviates, or no two agree and this one deviates most, the code is set.
Low severity. Can I keep driving?Yes, you can normally keep driving and take it to a repair shop when convenient.
Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.
Symptoms
- Check engine light on
- Usually no noticeable symptoms; substitute value used
- Slightly reduced power through knock protection possible
Most likely causes
- Sensor drifting or stuck
- Contact resistance at the connector
- A reference sensor reading wrong
- Sensor mounted wrongly or exposed to external heat
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
- It affects emissions.
What each character of P00E9 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 0: Subsystem depends on the code range
- E9: Specific fault in that system
Frequently asked questions
Can I keep driving with code P00E9?
Yes, you can normally keep driving and take it to a repair shop when convenient.
What causes code P00E9?
The most common causes are: sensor drifting or stuck; contact resistance at the connector; a reference sensor reading wrong.
Related codes
- P00E8Intake Air Temperature Sensor 3 Circuit Bank 1
- P00EAIntake Air Temperature Sensor 3 Circuit Low Bank 1
- P00EBIntake Air Temperature Sensor 3 Circuit High Bank 1
- P00ECIntake Air Temperature Sensor 3 Circuit Intermittent/Erratic Bank 1
- P00EEIntake Air Temperature Sensor 3 Circuit Range/Performance Bank 2
- P00CEIntake Air Temperature Measurement System - Multiple Sensor Correlation Bank 1
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
- gsi.ext.gm.com: 19OBDG03A Diagnostics
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.