Chevy Lumina Check engine code 45

AGORDON1

MEMBER
1945 CHEVROLET LUMINA

Engine Performance problem
Chevy Lumina 6 cyl Front Wheel Drive Automatic 98000 miles

Hi,
I have a 1991 Chevy lumina Euro. My cars check engine light is on and I had brought it to the shop and all he would tell me is the computer read Code 45. What does this mean? Also, my car lunges foward when I slow to about ten mile an hour. The rpm gage jumps up then down until I hold the brakes to a compleate stop. Recently, I noticed it is doing it now at 20 miles an hour? What can I do to fix this? Please help

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Diagnostic Trouble Codes - 1991
Chevrolet

DTC 45 Oxygen Sensor Circuit (Rich Exhaust Indicated)

13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
23 Manifold Air Temperature (MAT) Low Temp Indicated
24 Vehicle Speed Sensor (VSS) Circuit
25 Manifold Air Temperature (MAT) High Temp Indicated
32 Exhaust Gas Recirculation (EGR) Circuit
33 Manifold Absolute Pressure Sensor Circuit (High Sig.)
34 Manifold Absolute Pressure Sensor Circuit (Low Sig.)
42 Electronic Spark Timing (EST) Circuit
43 Electronic Spark Control (ESC) Circuit
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
51 Faulty PROM
54 Fuel Pump Circuit (Low Voltage)
55 55 ECM Error