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#6
Could run too rich and plug up your cats, resulting in a $1k+ repair...
They are suggested to be replaced every 100k... are yours failing? Kicking off fault codes? How many miles on the car?
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#9
60K interval listed in Bentley
According to my mechanic, the front two are the ones that most directly control mixtures, and the back two are primarily for reporting OBDII information. The front two are also the ones most likely to wear out.
For my 60K service, I did the front two, and will let the computer tell me when the back two need replacing.
For my 60K service, I did the front two, and will let the computer tell me when the back two need replacing.