OBD-II code · Powertrain (generic)
P03A3 Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic
Cylinder 2 pressure sensor signal jumps or drops out intermittently — connector or wiring issue. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P03A3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Cylinder Pressure Sensor
Related codes
- P0399Cylinder 1 Pressure Sensor Circuit Intermittent/Erratic
- P039FCylinder 2 Pressure Sensor Circuit
- P03ADCylinder 3 Pressure Sensor Circuit Intermittent/Erratic
- P03B7Cylinder 4 Pressure Sensor Circuit Intermittent/Erratic
- P03C1Cylinder 5 Pressure Sensor Circuit Intermittent/Erratic
- P03CBCylinder 6 Pressure Sensor Circuit Intermittent/Erratic
- P03D5Cylinder 7 Pressure Sensor Circuit Intermittent/Erratic
- P03DFCylinder 8 Pressure Sensor Circuit Intermittent/Erratic
- P03A0Cylinder 2 Pressure Sensor Circuit Range/Performance
- P03A1Cylinder 2 Pressure Sensor Circuit Low
- P03A2Cylinder 2 Pressure Sensor Circuit High
- P03A4Cylinder 2 Pressure Too Low
- P03A5Cylinder 2 Pressure Too High
- P03A6Cylinder 2 Pressure Variation Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.