ricasso

Ive just done a routine check for any codes that may have occurred recently and I'm getting the following:

PO133 BANK 1 HO2S SLOW RESPONSE

PO135 BANK 1 HO2S HEATER CKT

PO420 BANK 2 CATALYST MONITOR FAULT

P1133 BANK 1 HO2S SWITCH FAULT

The two O2 sensors on the right bank were renewed a year ago but the left one wasnt, I have our annual safety check due and Im planning to replace the cats before that anyway, last year the emissions were borderline and that was just after the sensors were replaced, would renewing the cats and the left hand sensor put things right or is there anything else that needs doing?

bogus

A rule of thumb is that all O2s should be replaced at the same time. Much like spark plugs.

As for the cats, how many miles on the car? OEM cats run past 125k miles...

PS: My Mom is from Ipswich.

ricasso

Hi Bogus, it's just hitting 70K so still quite low, when I got the car it had eliminators on it that used to backfire quite a bit, I was always led to believe backfiring could damage the cats, Ive since fitted Corsa's

You know what, I bought the car not very far from Ipswich!!

bogus

Small world society!!!

70k the cats SHOULD be ok. Unless they got leaded fuel in them, but the EU banned that stuff 20+ years ago.

The LT1 is prone to pops and such on deceleration. But the Corsa system is sooo nice.

I would check the O2s...