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Oxygen Sensor related Engine Codes - Don’t Jump to Conclusions!!

We often receive inquiries where an engine light is on, and the vehicle has been diagnostically scanned, and an Oxygen Sensor related engine code results.

Many people think that if you get one or more of these codes you must have a faulty oxygen sensor, however this is not necessarily the case, so don’t jump to conclusions.

Many engine codes may relate to the oxygen sensor however it is not always the sensor that is the cause of these codes. When you get an oxygen sensor engine code you must then diagnostically test, verify and confirm the source of the trouble code. Many engine codes relate to the oxygen sensor and its circuits, however the source of the code is often something else, such as the control mixture is too lean or rich, or the like.

Diagnostics, testing, removal and installation of oxygen sensors should always be carried out by suitably qualified persons.

If every code that related to oxygen sensors meant a faulty o2 sensor that needed replacing, then there would only need to be one code. This is not the case!

Examples of the possible codes you may get on a vehicle that relate to oxygen sensors:

P1083 Fuel Control Mixture Lean (Bank 1 Sensor 1) 
P1084 Fuel Control Mixture Rich (Bank 1 Sensor 1) 
P1085 Fuel Control Mixture Lean (Bank 2 Sensor 1) 
P1086 Fuel Control Mixture Rich (Bank 2 Sensor 1) 
P1087 O2 Sensor Circuit Slow Response in Lean Control Range (Bank 1 Sensor 1) 
P1088 O2 Sensor Circuit Slow Response in Rich Control Range (Bank 1 Sensor 1) 
P1089 O2 Sensor Circuit Slow Response in Lean Control Range (Bank 1 Sensor 2) 
P1090 Pre-Catalyst Fuel Trim Too Lean Bank 1 
P1091 Pre-Catalyst Fuel Trim Too Rich Bank 1 
P1092 Pre-Catalyst Fuel Trim Too Lean Bank 2 
P1093 Pre-Catalyst Fuel Trim Too Rich Bank 2 
P1094 O2 Sensor Circuit Slow Response in Rich Control Range (Bank 2 Sensor 1) 
P1095 O2 Sensor Circuit Slow Switching From Lean to Rich (Bank 1 Sensor 1) 
P1096 O2 Sensor Circuit Slow Switching From Lean to Rich (Bank 2 Sensor 1) 
P1097 O2 Sensor Circuit Slow Response after Coast Down Fuel Cutoff (Bank 1 Sensor 1) 
P1098 O2 Sensor Circuit Slow Response after Coast Down Fuel Cutoff (Bank 2 Sensor 2) 
P1132 O2 Sensor Heater Control Circuit (Bank 1 Sensor 1) 
P1133 O2 Sensor Heater Control Circuit (Bank 2 Sensor 1) 
P1134 O2 Sensor Heater Circuit Signal Intermittent (Bank 1 Sensor 2) 
P1135 O2 Sensor Heater Circuit Low Voltage (Bank 1 Sensor 1) 
P1136 O2 Sensor Heater Circuit High Voltage (Bank 1 Sensor 1) 
P1137 O2 Sensor Heater Circuit Signal Intermittant (Bank 1 Sensor 2) 
P1138 O2 Sensor Heater Circuit Low Voltage (Bank 1 Sensor 2) 
P1139 O2 Sensor Heater Circuit High Voltage (Bank 1 Sensor 2) 
P1151 O2 Sensor Heater Circuit Signal Intermittant (Bank 2 Sensor 1) 
P1152 O2 Sensor Heater Circuit Low Voltage (Bank 2 Sensor 1) 
P1153 O2 Sensor Heater Circuit High Voltage (Bank 2 Sensor 1) 
P1155 O2 Sensor Heater Circuit Intermittant (Bank 2 Sensor 2) 
P1156 O2 Sensor Heater Circuit Low Voltage (Bank 2 Sensor 2) 
P1157 O2 Sensor Heater Circuit High Voltage (Bank 2 Sensor 2) 
P1158 Fuel Trim Additve Bank 1 Low 
P1159 Fuel Trim Additve Bank 1 High 
P1160 Fuel Trim Additve Bank 2 Low 
P1161 Fuel Trim Additve Bank 2 High 
P1162 Fuel Trim Additve Per Ignition Bank 1 Low 
P1163 Fuel Trim Additve Per Ignition Bank 1 High 
P1164 Fuel Trim Additve Per Ignition Bank 2 Low 
P1165 Fuel Trim Additve Per Ignition Bank 2 High 
P1174 Fuel Trim Adaptation Additve Bank 1 Malfunction 
P1175 Fuel Trim Adaptation Additve Bank 2 Malfunction 
P1176 O2 Sensor Slow Response Bank 1 
P1177 O2 Sensor Slow Response Bank 2 
P1178 O2 Sensor Signal Circuit Slow Switching From Rich to Lean (Bank 1 Sensor 1) 
P1179 O2 Sensor Signal Circuit Slow Switching From Rich to Lean (Bank 2 Sensor 1) 
P1180 O2 Sensor Signal Circuit Slow Switching From Rich to Lean (Bank 1 Sensor 2) 
P1181 O2 Sensor Signal Circuit Slow Switching From Rich to Lean (Bank 2 Sensor 2) 
P1182 O2 Sensor (Bank 1 Sensor 2) Open Circuit During Coast Down Fuel Cut-off 
P1183 O2 Sensor (Bank 2 Sensor 2) Open Circuit During Coast Down Fuel Cut-off 
P1186 O2 Sensor Heater Control Circuit (Bank 1 Sensor 2) 
P1187 O2 Sensor Heater Control Circuit (Bank 2 Sensor 2) 
P1188 Fuel Control (Bank 1 Sensor 1) 
P1189 Fuel Control (Bank 2 Sensor 1) 
P1190 Pre-catalyst Fuel Trim System Bank 1

oxygen sensor related engine codes

If you need assistance identifying your oxygen sensor locations and vehicle configurations (Bank 1, Bank 2 etc) visit our O2 Sensor Identification and Locations page