P0300 Misfire damaging to catalytic converter P0301 Misfire, cylinder 1, damaging to catalytic converter P0302 Misfire, cylinder 2, damaging to catalytic converter P0303 Misfire, cylinder 3, damaging to catalytic converter P0304 Misfire, cylinder 4, damaging to catalytic converter P0305 Misfire, cylinder 5, damaging to catalytic converter P0306 Misfire, cylinder 6, damaging to catalytic converter
Okay, let's break down those trouble codes:
These error codes P030x are serious engine performance codes related to **engine misfires**. The key phrase "damaging to catalytic converter" indicates that your car's computer (the PCM) has also flagged these misfires for potentially harming the emissions system components.
Here's a breakdown of each code:
| Code | Description |
|------|-------------|
| P0300: Misfire Detected (Damaging Catalytic Converter) | This is an **overall** engine misfire. The PCM detected random or intermittent cylinder misfires in all cylinders, with spark timing adjustments disabled to prevent further damage. |
### Key Points
* These are serious codes requiring immediate attention.
* They relate to Engine Oil Temperature (EOT) sensors which monitor engine oil temperature, often linked to managing emissions controls and ensuring certain systems function correctly.
The user should be aware these are serious codes requiring professional diagnosis and repair. A mechanic is needed for proper testing using specialized tools like an OBD-II scanner or thermal couple tester on bank 2 wiring, especially if there's a possible exhaust leak between bank 2 upstream sensor and the catalyst.
