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Old 11-18-2012, 11:24 AM   #15
Manolito

Name: Manolito
Title: Member
Status: Offline
Join Date: May 2006
Location: Sacramento
Rate My Car: 339 / 340
Your Ride: (2) '97 328s; '04 330; '04 325iT
In any car, the rear oxygen sensors last longer than the front oxygen sensors, so it is common to replace them at different intervals. The owners manual, however, suggests changing all four at 90k miles.

Knowing that the sensors get slower with age, I like the idea of having a matching set, so I do all four at once.

That being said, if the car is running great and not throwing any codes, there is a strong argument for "if it ain't broke, don't fix it..."
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