Quote:
Originally Posted by Burg Boxster
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?  |
Yeah I'm clear on how you diagnose an o2 sensor issue. I had the same advice when I had an issue with my pre cat o2 sensors. Took a lot of diagnosis. Finally my mechanic found an o2 sensor wasn't conforming and had quite high resistance. Offered to change both. I said just the bad one. A month later the other one went out. So yeah, if they are the same age and one has a confirmed issue, I think it makes sense to replace them in pairs. By your logic if all my tires are old but only one goes flat I should only replace the flat tire right? It's called preventative maintenance for a reason.