Miles?
Original O2 sensors?
Classic failure mode for cat efficiency is for a motor to run very rich, which 'swamps' the O2 sensors and causes them to think the cat is bad. Saw a TON of cat replacements on the S62s for this, as those motors had aggressive tuning.
I dont know where those are on your car. Somewhere underneath. I mean get a jack and some wrenches and have at it.
Honestly if the O2s are old, replace them all.
But I am not sure o2s are the cause of your driveability issues. A air leak in the intake... or a bad vanos solenoid...or something impacting timing/advance...could all cause rich running, with sluggish responses.
Can you pull your AFRs? (Fuel rations, long and short term fuel trims)? Invest the 150 in a decent reader, it may be worth the effort...
GL
11-20-2019, 09:32 PM
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