So I have a code that I checked. It's Code 45. I found this is the right side Lambda sensor. The fix is either a vacuum leak, misfiring plug, or bad injector. I've got 120K and guessing the injectors were never changed. But I don't have the $ for all 8. I already did a tuneup new plugs, wires, cap, rotor, etc. Checked for vacuum leak but can't find one unless theres some hoses I don't know about. Doesn't seem to be but a couple under the hood. I sprayed starting fluid around trying to get a rise but nothing. Suggestions?


EDIT- I have no O2 sensors it seems. if I am looking in the right spot after the cats both sides are welded up. I'm guessing I will never be able to get rid of the light, but I still a little worried about the feeling of a misfire at higher speeds. Sometimes it seems to smooth out and sometimes feels a little rough running. Or it could just be a rough ride from a 20 yr old Disco rattling down the road.

 

'95 DI only has 2 Oxygen sensors pre-CAT.





If you are seeing the 2 post-CAT bungs welded then someone put a '96+ DI cat on. It's not a problem, but you should still have 2 O2 sensors pre-CAT.

 

You probably have a fault with that O2 sensor. At 120k the O2's are 20k overdue for changing anyways. Get them through Amazon. Run Techron through the fuel system to clean the injectors, skip a tank of fuel then run it again.

 

Buy the ntk ones not Bosch, amazon best pricing

Also make sure they are plugged into correct sides not sure on a 95, but my 98 o2 plugs are top of bell housing at rear of engine drivers side plug is orange, I only mention this since sounds like the y pipe was changed and if the sensors are crossed it will not be getting the correct readings per bank

 

Thanks guys! I also discovered a pretty big exhaust leak at the manifolds. Already bought gaskets just gotta change. I'm guessing this could throw off the sensor too. But I'm wondering if bad readings from the sensors can effect the run quality and mpg? From what I've seen in other threads the computer is pretty sensitive to the data it receives. I really don't care about emissions on this old of a car as long as it's not bothering the engine or mpg.