This makes no sense to me. And if, perchance you actually Needed "All" the O2 sensors: what is that, 2? I'm sure they can be bought on web for <$100 each (one for my '94 was 50ish; no need to install it yet - it's for a test.)

O2 sensors send a varying DC voltage signal to the ECU (engine control unit) when they return out-of-range values -- I guess you saw the CEL light come on = check engine light(?) The ECU itself can fail, but very rarely does so, from all hearsay accounts.. but when 2 or More? "O2 sensors" are said to have "failed" -??- well, you know the odds on coincidences. Such a diagnosis would be a Red flag for me.

Similarly: it's an unscrew, clean threads - screw-in "install". There is NO 'adjustment' - except that the ECU has to 'like' it (and if it didn't like a new one: you'd be looking, I hope: at a recycler yard price for an ECU. at least to plug-in and verify that yours is broken. Or is Not broken (Mfgs. Never give out diagrams for their black boxes, of course.) 'Course, maybe you don't have the time to cover your ass.

Could you be due for a Second Opinion kinda non-ripoff mechanic?

Timing belt R&Rs ARE 1000ish at dealer shop rates, on many cars. And about half that at decent independent mechanics. (And there are those, out there.) Dunno your brand.

C'mon Crazy - this is logic stuff; you don't have to roll over, play dead and eat foggy triple-digit estimates. An O2 sensor is a no-moving-parts piezo/ceramic thingy which generates voltages as the fuel/air mixture deviates from an ideal ratio. Most last 100Ks of miles..


Luck,

I.

Using a friend's new ATT hi-speed connection on Win 98SE -- which ATT won't ""support"" -- which *I*, who did not install it, just unflummoxed via simple logic and "let's try This, then". This post is the test that it is now connecting UP/DOWN OK, with no more Router-generated "PPPoE LCP negotiation fail" pop-up, on 'Connect'.

(And ... I've made it a jelloware-saving principle (thus far..) to Do No Networking == I grok this system about as well as you, apparently - grok cars. Right?) Hate to see folks get ripped off.