P0303
Cylinder 3 Misfire Detected
System: Ignition
Severity: medium
What does P0303 mean?
The DTC P0303 (Cylinder 3 Misfire Detected) is a fault code stored by the ECU when it detects a misfire cyl 3 condition in the ignition subsystem. It is commonly seen on European and Asian vehicles using Bosch, Continental, Siemens or Denso ECUs.
Common causes of P0303
- Spark plug/coil
- Injector
- Low compression
How to fix P0303
Component swap diagnosis.
Tuning approach with DaVinci Deluxe
For P0303, DaVinci Deluxe offers the following ECU map adjustments and software solutions:
- Misfire threshold adjust
- Per-cyl trim
Need to fix P0303 on your ECU?
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