I bought the Atlantic British fronts recently. So far, so good. Why cheap out on o2 sensors? Good ones are only $50-70 each. I'm used to buying ones for our Audi's at $75-125 each!!!

 

"Why cheap out on o2 sensors?"

When people buy these trucks for $3k they think they are cheap vehicles and that mindset prevails apparently. Just because the buy in is cheap does not make these trucks cheap in any way to maintain. You are still maintaining a premium $35- $40k machine even though it has no resale value.

You still have to maintain it the same as if you paid full price.

 

I couldn't agree more!

 

Atlantic British Has rears at $63
Land Rover Discovery 2 Oxygen Sensor (Part # MHK100930)

 

On this topic, one says Bosch are dependable, someone else says they have issues. I'm asking because I just replaced all four with new Bosch, and today, about two weeks later, I have cyl 2,4,6,8 misfiring. Bad sensor?

 

Probably. Not many complaints on the Atlantic British ones.

 

Bad O2 sensors shouldn't (won't?!) cause misfiring, ever. Maybe there's some low-probably edge case exception, but in general they won't cause a misfire.

What happens when an O2 sensor is bad is the same as when they are unplugged: your ECU goes into "open loop" mode and bumps up fuel flow 25% above preprogrammed tables of computer data stored for your outside temperature (air intake), engine temperature (coolant), load, throttle position, alternator/battery voltage, timing advance, and RPMs.

So you run rich which is the least likely way to cause misfires.

(now watch some guy post something that proves me wrong and makes me feel silly)

Anyway, you could test what I'm saying by swapping your two upstream O2 sensors from left to right/etc. to see if your misfires swap over to the other engine bank.


*off topic of O2s, but if you have a misfire on an entire Bank (e.g. 2,4,6,8) then I'd personally consider swapping coils to see if the misfires swap sides to 1,3,5,7. Of course, check your ECU error codes in case your computer already detects a problem on that bank, too.

 

Sigh.

It's happened to me. Three and a half years ago my truck had misfires on cylinders 2, 6 and 8. All appeared nearly simultaneously. I swapped front O2s side to side and the misfires moved to the other side. I installed a new O2 and the problem was solved.

Really? Check the RAVE. The coils are not bank-specific. One coil supplies cylinders 1, 4, 6, and 7 and the other supplies cylinders 2, 3, 5, and 8.

 

Good to know. Thanks.

 

I had misfire codes along with o2 codes when my fronts went bad.