Recently took car to KwikFit & got whole exhaust replaced including CAT. Engine light came on. Back to KwikFit - diagnosed O2 sensor. Simply re-set it so light off for a bit but came on again. Tried running it for a few days to see if it would re-set itself. No luck. Going to take it back to KwikFit - they caused the problem after all.
What should I be asking them to do? Is this a new sensor(s) issue? Different CAT? Really inconvenient for me so need to get it sorted & not just re-set again.
Thanks for any advice.
JM
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