A ladyfriend of mine has an 07 IS250 that has had the check engine light on for some time. The dealer diagnostic says oxygen sensor, bank 1, sensor 1.

I checked another dealer parts and the desk was a bit unsure of the part

I presume it is driver side pre-cat. Parts dept quoted $177.19 for part number 8946530730.

A diagram for the IS350 seems to show the front sensors have the harness plug in the engine bay while the rears pass through the floor making rears a trickier install. Front SHOULD be easier.

My experience tells me not to have 100% faith in the diagnostic results.

Anyone else have an O2 failure?

I will buy the OEM part vs. aftermarket but do not want to buy the wrong one only to have to return/exhange it if wrong and definitely if there is possibly something else triggering the check engine light.

Comments suggestions from anyone with experience is definitely appreciated.

Thanks guys.

 

buy the o2 sensor from rock auto. oem denso and cheaper than dealer.


don't assume which o2 sensor it is. get someone with more knowledge to diagnose the issue.