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How did you 'change your cats'? Which bits did of the exhaust system did you move/remove? Which exhaust gaskets did you replace whilst doing so? Are all the gaskets mating/sealing well?
An exhaust leak upstream of the cats could/would, cause bad values from the O2 sensors and effect (closed loop) fuelling.
An exhaust leak upstream of the cats could/would, cause bad values from the O2 sensors and effect (closed loop) fuelling.
