Please excuse this if it's blindingly obvious to you - My brain struggles with this stuff.
I've been getting 16804 Cat system, bank1 Efficiency below threshold for some time now. I understand that this may be either a faulty O2 sensor or a knackered CAT. So normally you would change the sensor first because it's cheaper and cross your fingers it doesn't throw the code again.
Given that the car just failed the MOT on emissions - O2 out of range - does that confirm beyond any doubt that it is in fact the CAT at fault?
The O2 sensor and the MOT gas test are essentially reading the same thing?
Money's tight so if I can 'just' change the CAT and save myself the £60 for the sensor that £60 goes toward other stuff to get the MOT sorted.
Cheers
I've been getting 16804 Cat system, bank1 Efficiency below threshold for some time now. I understand that this may be either a faulty O2 sensor or a knackered CAT. So normally you would change the sensor first because it's cheaper and cross your fingers it doesn't throw the code again.
Given that the car just failed the MOT on emissions - O2 out of range - does that confirm beyond any doubt that it is in fact the CAT at fault?
The O2 sensor and the MOT gas test are essentially reading the same thing?
Money's tight so if I can 'just' change the CAT and save myself the £60 for the sensor that £60 goes toward other stuff to get the MOT sorted.
Cheers