OBD-II code · Powertrain (generic)
P0074 Ambient Air Temperature Sensor Circuit A Intermittent/Erratic
Intermittent dropouts or noise on the ambient air temperature sensor A signal — typically a loose connector or chafed wiring.
Is it safe to drive with P0074?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector loose or corroded
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Ambient Air Temp Sensor, Sensor Wiring
Related codes
- P00DDAmbient Air Temperature Sensor Circuit B Intermittent/Erratic
- P0071Ambient Air Temperature Sensor Circuit A Range/Performance
- P0072Ambient Air Temperature Sensor Circuit A Low
- P0073Ambient Air Temperature Sensor Circuit A High
- P0075Intake Valve Control Solenoid Circuit Bank 1
- P0076Intake Valve Control Solenoid Circuit Low Bank 1
- P0077Intake Valve Control Solenoid Circuit High Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.