Intake Air Temperature/Ambient Air Temperature Correlation
Table of contents
P009A MERCURY Possible Causes
- Faulty Intake Air Temperature (IAT) or Ambient Air Temperature (AAT) sensor
- Biased IAT or AAT sensor
How do I fix code P009A MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P009A MERCURY code
The cost of diagnosing the P009A MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P009A MERCURY Description
The P009A code indicates that the Intake Air Temperature (IAT) and Ambient Air Temperature (AAT) sensor readings differ by more than a calibrated value.