Hey all,

I changed my front o2 sensors a couple of months ago because they were bad and my Rover ran great. Last week my SES light came on with a bad o2 sensor code, front driver side. So I went to Advance Auto and picked up the very same o2 sensor by Bosch. When I removed the old one today I noticed there was oil at the connector and this got me worried. I'm thinking the oil in the o2 was the cause of the failure. Is it normal to have oil in a bad o2 sensor? I'm hoping that the failure was just a coincedence of a defective sensor and nothing more serious. Any thoughts anyone? Also, when I change my oil I put exactly 6 qts but when I check it, it's about a 1/4" past the full line. I figured it's a very small amount and shouldn't do any harm. Can this be a possible reason? Thanks all.

 

There are several reasons for getting a O2 code.
If the connector gets contaminated, like oil in it.
Clean the connector with electrical contact cleaner, let it dry and put it back together, clear the code and see if it comes back.
Coolant in one or more combustion chambers.
The need for a tune up.

As far as the oil goes.
Wont hurt anything.
if it continues to get higher and higher up the dipstick then you are getting coolant in the crankcase.

 

you have an oil leak and you need to fix it or else you are spending more money to fix the same problem over and over.

 

Thanks for the responses guys. I don't think I have an oil leak because I check my oil every week and it never gets lower on the dipstick. Also I park in my garage and I never see a drop of oil on the concrete.