By BAT Team (Contact Me)
Last Updated 2017-01-17
A site with free advice from mechanics.

We recommend Torque Pro

Manufacturer Specific Definitions for P1138

MakeFault Location
AudiLong term fuel trim, idling, Bank 2 - system too lean
BmwKnock Sensor 4 High Input
BuickHeated oxygen sensor (H02S) 2 -signal above threshold (rich)
CadillacHeated oxygen sensor (H02S) 2, bank 1 voltage high
ChevroletHeated oxygen sensor (H02S) 2, bank 1 voltage high
CitroenLack Of HO2S12 Switch - Sensor Indicates Rich
FordLack Of HO2S Switches Bank 1 Sensor 2 Rich
GmcHeated oxygen sensor (H02S) 2, bank 1 voltage high
GmHO2S Bank 1 Sensor 2 Rich or High Voltage
InfinitiSwirl Control Valve Control System Performance
IsuzuHeated oxygen sensor (H02S) 2 – voltage high
JaguarHeated oxygen sensor (HO2S) cylinders 1, 2, 3 - indicates rich
KenworthP1138 - WRAF heater CJ125 undervoltage fault
Land RoverHeated oxygen sensor (H02S) 2 -cylinders 1,   2, 3 – mixture rich
LincolnHeated oxygen sensor (H02S) 2, bank 1 -not switching, fuel trim (FT) rich mixture
MazdaHeated oxygen sensor (H02S) – rear- adaptive limit achieved
Mercedes-BenzHeated oxygen sensor (H02S) 2 – range/   performance problem
MercuryHeated oxygen sensor (H02S) 2, bank 1 not switching·, fuel trim (FT) rich mixture
MiniO2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2
NissanIntake manifold air control solenoid – circuit malfunction
OldsmobileHeated oxygen sensor (H02S) 2 -voltage high
PeterbiltP1138 - WRAF heater CJ125 undervoltage fault
PeugeotLack Of HO2S12 Switch - Sensor Indicates Rich
PontiacHeated oxygen sensor (H02S) 2, bank 1 voltagehigh
PorscheOxygen Sensing
SaabHeated oxygen sensor (H02S) 2, bank 1 – voltage high
SaturnHeated oxygen sensor (H02S) 2, bank 1 voltage high
SuzukiHO2S Circuit High Voltage During Decel Fuel Cut-Off Sensor 2
VolvoHeated oxygen sensor (H02S) 1, bank 2- rich
VolkswagenLong term fuel trim, idling, system too lean

Help Us Help You

We have not gotten around to publishing a technical guide specifically for P1138 yet.

To escalate the priority of this guide in our production queue, please let us know the specifics of your vehicle (make, model, year, miles, and engine) and make a $9.99 donation via the payment button below. We will follow up immediately with additional questions as needed and email you a detailed guide for your vehicle.

Please help support us and let us help you.