o2 Oxygen sensor

I have a 1991 Corvette and the local chevy parts dept says I have 2 o2 sensors but I only have 1 on the drivers side?  Anybody else run into this?  And what was the outcome and please post a correct part#  

there have always been 2 on those....     the right side is not as visible...

these are delco part numbers....   at a dealer they will have a different part number for them to use.. but it will have the AFS numbers on the bag also...

SENSOR ASM,OXY
Part Number:  213-3857
Product Notes:
[Oxygen Sensor]; Universal Upstream
Per Vehicle: 2; Years: 1984-1991
Vehicle List

SENSOR ASM,EXH OXY
Part Number:  AFS21
Product Notes:
[Heated Oxygen Sensor (Position 1)]; In exh manifold/crossover ; Type #21
Per Vehicle: 2; Years: 1988-1991
Vehicle List
CORVETTE(10) 1982-1992
1992 V8-350ci 5.7L F/I Vin P
1991 V8-350ci 5.7L F/I Vin 8
1990 V8-350ci 5.7L F/I Vin 8
1989 V8-350ci 5.7L F/I Vin 8
1988 V8-350ci 5.7L F/I Vin 8
1987 V8-350ci 5.7L F/I Vin 8
1986 V8-350ci 5.7L F/I Vin 8
1985 V8-350ci 5.7L F/I Vin 8
1984 V8-350ci 5.7L F/I Vin 8
1982 V8-350ci 5.7L F/I Vin 8
CORVETTE LT1(1) 1993-1993
1993 V8-350ci 5.7L F/I Vin P

SENSOR ASM,EXH OXY
Part Number:  AFS22
Product Notes:
[Heated Oxygen Sensor (Position 1)]; In exh manifold/crossover ; Type #21
Per Vehicle: 2; Years: 1988-1991

CORVETTE(14) 1980-1992
1992 V8-350ci 5.7L F/I Vin P
1991 V8-350ci 5.7L F/I Vin 8
1990 V8-350ci 5.7L F/I Vin 8
1989 V8-350ci 5.7L F/I Vin 8
1988 V8-350ci 5.7L F/I Vin 8
1987 V8-350ci 5.7L F/I Vin 8
1986 V8-350ci 5.7L F/I Vin 8
1985 V8-350ci 5.7L F/I Vin 8
1984 V8-350ci 5.7L F/I Vin 8
1982 V8-350ci 5.7L F/I Vin 8
1981 V8-350ci 5.7L 4 BBL Vin 6
1980 V8-305ci 5.0L 4 BBL Vin H
1980 V8-350ci 5.7L 4 BBL Vin 6
1980 V8-350ci 5.7L 4 BBL Vin 8
CORVETTE LT1(1) 1993-1993


just curious....  do you have an oxygen sensor code????     does you corvette have air injection????  if so.. you might want to test the diverter valve... make sure it is not leaking any uncommanded air into the upstream exhaust... (the upstream exhaust is the tubes that feed into the exhaust manifolds...)       when the air injection check valves go bad... they let HOT exhaust backwards up the air injection tubing and it melts the tip of the plastic diverter valve ... this lets air flow continiously into the exhaust manifolds and messes up the exhaust stream as it passes the oxygen sensors...

the computer commands the diverter valve to dump upstream air only for the first 60 seconds after a cold start or until the oxygen sensors start to respond...   it also commands it do dump upstream air during some deaccelerations and at Wide open throttle...  i have not studied the computer program.. i just know from all the years i have fixed cars and all the delco training classes i have taken over the years..  

Thanks Wayne but I looked everywhere I dont see anything on the right side.  But thanks for the part numbers I will try them out.  I don't think I have air injection.  It's an L98 and looks like it just has tuned fuel injection with a throttlebody.  

I had error code H44 and H45 on the left side.  It seemed to run better when the engine was cold.  I got a o2 sensor from kragen for now and it runs alot better but still idles rough after it heats up.  Any ideas?