Quote:
Originally Posted by jdraupp
It's not inadvisable. If you don't replace them at the same time they don't get any younger. At the least they should be replaced in pairs.
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No true either. For the countless time...
Error codes showing bad O2 sensor(s) only mean value being reported from sensor is outside of norm. Period.
Before replacing
ANY O2 sensor you need to find out WHY it/they caused error code. Could be MAF is bad but you won't know until
after you've thrown many $100 at sensors and subsequently a couple more at a new MAF. Maybe mice chewed thru lead wire of one... you only need to replace that one, or for some odd reason one prematurely fails - no need to replace 3 others when they test fine. After all they're sold as 'eaches' for a reason and not pairs or sets like brake pads.
O2 sensors are easily tested w/ a multi-meter to find out if good or not. Only then should you replace bad one(s). Personally, I've had O2 sensors outlast others by more than 20,000 miles regardless of B / S positioning.
Should one replace all four tires and TPMS valve stems every time TPMS light illuminates - or just "in pairs" as you prescribe?
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