DTC Troubleshooting: P0134
DTC P0134: A/F Sensor (Sensor 1) Heater System Malfunction
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P0135 is stored at the same time as DTC P0134, troubleshoot DTC P0135 first, then recheck for P0134.

DTC Description
Confirmed DTC
Pending DTC
P0134 A/F Sensor (Sensor 1) Heater System Malfunction
    

1.
Problem verification:

Problem verification
?1.
Record all the on-board snapshots with the HDS.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine, and let it idle without load (in neutral) for at least 1 minute.

?5.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
Engine Speed
Vehicle Speed
ECT Sensor 1
MAP Sensor (Hi Res)
REL TP Sensor
Signal
Current conditions
Values
Unit
Engine Speed
    
Vehicle Speed
    
ECT Sensor 1
    
MAP Sensor (Hi Res)
    
REL TP Sensor
    

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0134 A/F Sensor (Sensor 1) Heater System Malfunction
    

Is DTC P0134 indicated?

     
YES
     
     
     
The failure is duplicated. Replace the A/F sensor (Sensor 1).?
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the relay circuit board (PGM-FI subrelay circuit), and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?