Just wondering if anyone else has expereinced this. Had my waterpump changed at local, very well respected Indy. Had a LNE low temp thermostat installed at the same time. When I picked up the car the CEL came on. He reset it and said all should be good. Drove fine but when I started it the next day, the CEL came on again. Took it back and he found that the passenger side O2 sensors (Bank 2) were no longer functioning and would need to be replaced.

He said that on occasion these fail when they are unplugged and then plugged back in. He had unplugged them to drop the exhaust on that side.

Any one else experience this? Have ordered new ones from Suncoast.

Ted

 

Fail when they get unplugged?!?! Bunch of BS.

 

Any idea what could cause one bank to fail? Want to make sure it doesn't happen again. O2 sensors are expensive!

 

Have you checked to make sure they got plugged back in? Seems odd it would be both sensors on the same bank suddenly. Did he mention what the failure codes were. Short to ground, internal resistance, etc?

 

I would make sure conections are clean and wires didnt get damaged by pulling/hot exhaust etc. they can be checked for resistance ohms etc.I doubt they would go bad by just disconecting.I have found in the past when one goes bad the others arent far behind.

 

I Agree WTF are we stupid I think not. They do loose voltage every time you turn the key to the left..

 

Thanks for the input. I don't even know what they look like so cant check for myself. Appreciate the help though.

Ted

 

They screw into the exhaust pipe, like a spark plug and have a wire bundle coming out of it. Very easy to spot. Follow the wire and see if the connectors are hooked up. The shop could have forgotten unplugging them end the wires got damaged. There are several possibilities but someone needs to look at it first. Oxygen sensors DON'T fail because they were disconnected. Find another mechanic. This one knows how little you know and is taking advantage of it. Real shame. It's like telling you that you that your alternator is low and needs to be filled up. Total BS.

 

The o2's plug into the wiring harness below the air box, on the very back of the car. Two on each side. Grey clips with red ends.

Nick

 

Thanks for the help!

 

(quote)He said that on occasion these fail when they are unplugged and then plugged back in.


I bet that guy is brilliant with christmas lights lol.

 

Had the CEL come on today for the first time ever since i've owned the car. Went to the dealer mechanic.... apparently O2 sensor(s) suspect. 0_o

goodbye cruel world.....

 

Ask them which one failed. There are four sensors and the trpuble code will tell the exact one.

 

ok will find out monday, are these hard to access? your opinion, I respect

 

Not hard at all. Just unplug the connectors, un-screw the O2 sensor from the exhaust (near the cat) and then work backwards with the new sensor.

This stuff is easy and there really is no reason to pay someone else's husband to un-clip and un-screw something you can do with standard everyday tools.