P0127
Intake Air Temperature Too High
Intake air temperature exceeds the safe maximum. Risk of preignition or knock; ECU may reduce power.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Intercooler airflow blockedCommon
Parts involved
- IAT Sensor
- Intercooler
- Cooling System
P0127 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.