Quote:
Originally Posted by ljowdy
I've noticed that upstream oxygen sensors are less expensive than downstream sensors yet, Wayne's 101 Project book says that all 4 are the same. Does anyone know why there is a price difference as well as a parts number difference?
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I don't know what year your Boxster is but I have an '07 and the upstream sensor is the newer "wideband air/fuel ratio" sensor, and these are much more expensive than the downstream sensor (which are the "regular" O2 sensors).
Regards,
paul...
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07 Boxster S, 03 MB E320 (wife's car), 10 Subie Forester X
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