System to rich bank 1 & bank 2

[madasahatter]

Replaced both front oxygen sensors, genuine denso and also genuine maf sensor. Car runs roughly 4 days no issues then engine light again.

I have recently had to change the dreaded main fuse. So no water in the ecu compartment.

[scudney]

Coil pack maybe?

[ColinBarber]

3 hours ago, madasahatter said:

I have recently had to change the dreaded main fuse.

What happened?

 

The areas of investigation for too rich are on the right of the table below, in order of likelihood - however for both banks to be affected, I wouldn't suspect an injector or A/F sensor as they are bank specific and you wouldn't normally get multiple failures at once.

P0172 P0175

With warm engine and stable air-fuel ratio feedback, fuel trim considerably in error to rich side  (2 trip detection logic)

Injector leakage or blockage MAF meter ECT sensor Ignition system Fuel pressure Gas leakage from exhaust system  Open or short in A/F sensor (bank 1, 2 sensor 1) circuit A/F sensor (bank 1, 2 sensor 1) A/F sensor heater (bank 1, 2 sensor 1) A/F HTR relay A/F sensor heater and A/F HTR relay circuits ECM

[madasahatter]

While i was checking fuses, noticed the main fuse had been butchered.