: Engine Error Codes...Please Help

05-06-06, 06:49 PM
Hey fellow Caddy lovers, i have the following codes and would appreciate if anyone can help me out with the problem.

P1139 - Heated Oxygen Sensor (HO2S) Insuff. Switching Bank 1 Sensor 2
(I dont know if this is an actual o2 sensor problem or the wiring, can someone tell me the location and part number if possible)

C1241 - Variable Effort Steering Circuit Malfunction
C1738 - Exhaust Solenoid Valve Short to GND
(I have been driving with these two error codes for a while now, is it ok to ignore? If not is it hard to fix?)

Thanks for the help

05-06-06, 10:24 PM
P1139 is telling you that you have an O2 sensor that is getting sluggish in its response times. If it is current and keeps coming back, then the sensor needs to be replaced. Bank 1 Sensor 2 is the pre-cat sensor.

C1738 is regarding the ELC (Electronic Level Control) compressor exhaust valve.

05-07-06, 02:44 AM
Thanks ranger, from what i can remember, there are two pre-cat o2 locations, one in the front of the engine and one behind (which requires a crow foot to get to), can you tell me which one of these i have to replace?

as for the ELC, how do i go about fixing that problem?

Thank you for your time and help sir, have a great day.

05-07-06, 09:50 PM
There are 4 sensors.
Bank 1 Sensor 1 - right bank (firewall side) manifold
Bank 1 Sensor 2 - pre-cat
Bank 1 Sensor 3 - aft-cat
Bank 2 Sensor 1 - left bank (radiator side) manifold

Not exactly sure how you would go about fixing the ELC problem, but I believe the exhaust valve can be replaced without replacing the entire compressor. A FSM would give you more information.