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 Cloud Edition
For P0303, DaVinci Deluxe Cloud Edition offers the following ECU map adjustments and software solutions:
- Misfire threshold adjust
- Per-cyl trim
Need to fix P0303 on your ECU?
DaVinci Deluxe Cloud Edition is professional ECU tuning software trusted by 800+ workshops. From €49.99 (24-Hour Pass), €100.99/month or €1009/year — or test it first with the Real Software Test: €9.99 for 7 days, then €100.99/month unless you cancel in one click.
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