Code P0420

hasteyoman

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Buick Ownership
2006 buick lucerne cxl
my po420 code is on, on my 2006 buick lucerne. even if i clear it it comes within 2-4 days. really getting irritated. changed the catalytic converter and a 02 sensor .. please help
 

2007LucerneCXL

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Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
On the code if a shop or if you are doing the repairs. There's two O2 sensors and it's possible, depending on sequence of repairs that the harness / O2 sensor may have been damaged or it's a poor quality aftermarket O2 sensors. A O2 sensor extender may resolve the problem, the type of catalytic converter may also be the cause. How many miles and what type of driving, highway or city, since installing?

Another site that may help.
 
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