O2 sensor confusion
#17
Ok guys i just changed the sensors in my car upstream and downstream installed Oem cats as well n took off the test pipes reset the ECU and STILL STILLL STILLL STILLL GIVING ME THESE DAMN CODES P1168 P1148 P1031 P1051 LIKE WTH IS GOING ON MECHANIC TOLD ME IT CAN BE AN ELECTRICAL PROBLEM IDK THIS IS VERY FRUSTRATING AND MY DAD KEEPS TELLING ME JUST GO TO THE DEALERSHIP AND THEIR GONNA CHARGE ME AN EYE AND AN ARM , STILL TRYING FIGURE OUT WHATS GOING ON AnYone has any inputs and what am i doing wrong perhaps ????
Last edited by acee; 08-11-2014 at 07:15 AM.
#21
#22
Premier Member
iTrader: (11)
Codes P1168, P1148 are for CLOSED LOOP CONTROL. Codes P0031, P0051 are for Sensor 1 Heater circuit. All codes you have listed are pointing to a problem with Sensor 1 (primary) on both sides.
If you've replaced them, then there may be a wiring issue that you'll need to chase down.
Here's some verbiage from the FSM to help you troubleshoot:
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
P0031 - (Bank 1)
P0051 - (Bank 2)
Problem:
Air fuel ratio (A/F) sensor 1 heater control circuit low input
Condition:
The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)
Possible Cause:
* Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
* Air Fuel ratio (A/F) sensor 1 heater
DTC P1148, P1168 CLOSED LOOP CONTROL
P1148 - (Bank 1)
P1168 - (Bank 2)
Problem:
Closed loop control function
Condition:
The closed loop control function does not operate even when vehicle is driving in the specified condition.
Possible Cause:
* Harness or connectors [The air fuel ratio (A/F) sensor 1 circuit is open or shorted.]
* Air fuel ratio (A/F) sensor 1
* Air fuel ratio (A/F) sensor 1 heater
NOTE: If DTC P1148 or P1168 is displayed with another DTC for air fuel ratio (A/F) sensor 1. Perform the trouble diagnosis for the corresponding DTC.
If you've replaced them, then there may be a wiring issue that you'll need to chase down.
Here's some verbiage from the FSM to help you troubleshoot:
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
P0031 - (Bank 1)
P0051 - (Bank 2)
Problem:
Air fuel ratio (A/F) sensor 1 heater control circuit low input
Condition:
The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)
Possible Cause:
* Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
* Air Fuel ratio (A/F) sensor 1 heater
DTC P1148, P1168 CLOSED LOOP CONTROL
P1148 - (Bank 1)
P1168 - (Bank 2)
Problem:
Closed loop control function
Condition:
The closed loop control function does not operate even when vehicle is driving in the specified condition.
Possible Cause:
* Harness or connectors [The air fuel ratio (A/F) sensor 1 circuit is open or shorted.]
* Air fuel ratio (A/F) sensor 1
* Air fuel ratio (A/F) sensor 1 heater
NOTE: If DTC P1148 or P1168 is displayed with another DTC for air fuel ratio (A/F) sensor 1. Perform the trouble diagnosis for the corresponding DTC.
#24
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