Oil code is set after a 10min timeout when the oil pressor sense disallows the MDS system to engage after multiple attempts. In most cases, its because an end-user has somehow come to the ridiculous conclusion a higher viscosity engine oil offer better protection. It doesn't - nor will it ever!
P0420 can be many things:
P0420 can be many things:
- Damaged muffler or leaks in the muffler.
- Damaged exhaust manifold or leaks in the exhaust manifold.
- Damaged exhaust pipe or exhaust pipe leaks.
- A misfire in the engine.
- Oil contamination in catalytic converter.
- Faulty catalytic converter (most common).
- Faulty engine coolant temperature sensor.
- Faulty front oxygen sensor.
- Faulty rear oxygen sensor.
- Damaged oxygen sensor wiring.
- Oxygen sensor wiring that is not properly connected.
- Damaged oxygen sensor connectors
- A leaking fuel injector.
- High fuel pressure.
- Use of the wrong kind of fuel (using leaded fuel instead of unleaded fuel)
