Where is the 02 sensor located on a 1995 corvette? Are there two of them? LT1 motor

 

Under vehicle, passenger side, below seating area, rear of catalytic converter, mounted in exhaust pipe.

 

Popped the hood and saw an 02 sensor in front of the converter, are there two of them?

 

Yes, you have two of them, one on each bank.

 

On the 95 (OBD1) there is an 02 sensor forward of the cat on each side. Easier to see the passenger side one as you can look straight down at it, with the hood up of course. There is a dummy sensor that does nothing on the passenger side only after the cat. In 96 they went to OBD2 with sensors before and after each cat. Hope this helps.

 

Thanks

Plan on replacing this sensor on Saturday, might as well change the oil while I'm at it. Note: Went to Autozone to see if they could give me a reading on what was going on. They pulled out a little hand held device which would not recognize anything. Lucky for me I work on an Air Force Base so I took it to the auto hobby shop. A tech there pulled out a fancy looking device a little larger than a lap top, this thing did everything, very impressive. Cost me $25 but thought it was money well spent. Told me that the right side 02 sensor was running lean and needed to be replaced. Not planning on getting it at Autozone, think I'll try O'Rielys.

 

Did he mean the sensor was giving a bad reading, or the sensor was bad? Meaning is it running lean on the right bank and the sensor is correctly reporting the condition, or is it running right and the sensor is giving bad (incorrect) readings? Advice--stay with ac/delco sensors, lot of members here have reported problems with some aftermarket brands. ps--my son is at Sheppard AFB and one of his best friends is at your base (airborne radar specialist).

 

The right bank O2 sensor is sending a lean signal. More than likely, if you have not messed around that area, the O2 sensor just needs replacing. There could be many things that will cause a code to set and tell you the O2 sensor is reading a lean condition. You will need a FSM to help troubleshoot or just replace the sensor and hope it works.

 

so what one do I need to change

 

With a Tech-1 or similar scanner, you can observe the voltage swing average of the O2s as the engine idles. Normally they should read near the middle or a little less (say ~ 450 mV). But, a reading in double digits would indicate a LEAN condition. That being the case, Either the O2 is going bad, OR in fact that bank of cylinders is running LEAN.

Two ways to further investigate: The easiest is to swap sides and see if the readings follow the particular sensor, or are the readings consistent with that particular bank of cylinders? But, before you swap sides, take a reading of the injector dwell time. If the dwell is longer on the side where the O2 is reading lower than the other (by a significant amount), that is to be expected. And, if after swapping the two the dwell time also changes sides, you have double the indication of a bad O2..

Cross counts is the number of times the O2 voltage swings from high to low over a period of seconds. They vary depending on idle rpm and to some extent mixture, but they should be approximately even what ever the cross count number reads. However, if one sensor is reading significantly less cross counts than the other, (e.g., one is reading say 150 and the other is reading 20) the sensor reading low indicates a "lazy" O2 sensor and it needs to be replaced.

Change BOTH O2s. And, as mentioned, stay away from the Bosch O2s and stick with AC Delcos The Bosch have a history of failing (going to ZERO volts resulting in that side going very RICH. Ask me how I know!!)

 

This is what I got