catalytic converter

2000 AUDI A6
151,000 MILES
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EDDIE D
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HELP, A check engine light stated that I need a new catalytic converter. I had both replaced (bank 1 and bank 2) Less than 5000 miles later the check engine light went on again. Had it scanned several times and the results stated that I need to replace both(2)catalytic converters again. (parts Po 221 and PO231. AGAIN? My local Audi mechanics are perplexed. Scanner once again states that both have to be replaced. - (insufficient warmup efficiency).Mechanic stated that it might be one of 4 oxygen sensors but does not know which one it is and there is no way of testing which one might be bad.
Someone please help. Is it really a bad oxygen sensor? ed ps I also had the ECM replaced. Did not do the trick
Nov 26, 2011 at 4:48 PM
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JACOBANDNICKOLAS
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It could be an O2 sensor. They need to check each to see if they meter within the manufacturer's spec. IT can be done. Also, they can check each with a live scanner. They can actually see how each o2 sensor is responding. KEEP IN MIND: The new converters are under warranty.
Nov 26, 2011 at 7:45 PM