P1100

MAF Intermittant (Mazda)

P1101

MAF Out Of Range (Mazda)

P1106

Manifold Absolute Pressure (MAP) sensor circuit intermittent high voltage

P1107

Manifold Absolute Pressure (MAP) sensor circuit intermittent low voltage

P1108

BARO to MAP signal circuit comparison too high

P1111

Intake Air Temperature (IAT) sensor intermittent high voltage

P1112

Intake Air Temperature (IAT) sensor intermittent low voltage

P1114

Engine Coolant Temperature (ECT) sensor circuit intermittent low voltage

P1115

Engine Coolant Temperature (ECT) sensor circuit intermittent high voltage

P1115

Intake Air Temperature 2 Circuit High Input (Ford)

P1116

ECT Sensor Out Of Range (Mazda)

P1116

ECT Sensor Out Of Range (Ford)

P1117

ECT Intermittent (Mazda)

P1117

ECT Intermittent (Ford)

P1120

TPS Out Of Range Low (Mazda)

P1120

TPS Out Of Range Low (Ford)

P1121

Throttle Position (TP) Sensor Inconsistent With MAF Sensor High Voltage

P1122

Throttle Position (TP) Sensor Inconsistent With MAF Sensor Low Voltage

P1124

TPS Out Of Self Teat Range (Mazda)

P1124

TPS Out Of Self Teat Range (Ford)

P1125

TPS Intermittant (Mazda)

P1125

TPS Intermittant (Ford)

P1127

Exhaust Not Warm Enough, Downstream Sensor Not Tested (Ford)

P1128

MAP Lower Than Expected (Acura)

P1129

Upstream O2 Sensors Swapped Bank To Bank (HO2S-11-21) (Ford)

P1129

MAP Higher Than Expected (Acura)

P1129

Downstream O2 Sensors Swapped Bank To Bank (HO2S-12-22) (Ford)

P1130

Heated O2 Sensor (HO2S) 11 At Adaptive Limit (Mazda)

P1130

Lack Of HO2S-11, Fuel Trim At Limit (Ford)

P1131

HO2S 11 Indicates Lean (Mazda)

P1131

HO2S 11 Indicates Lean (Ford)

P1132

HO2S 11 Indicates Rich (Mazda)

P1132

HO2S 11 Indicates Rich (Ford)

P1133

Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1 (Rear Bank)

P1134

Heated Oxygen Sensor (HO2S) transition time ratio bank 1 sensor 1 (Rear Bank)

P1137

Lack Of HO2S-12 Switch Indicates Lean (Ford)

P1138

Lack Of HO2S-12 Switch Indicates Rich (Ford)

P1150

Lack Of HO2S-21 Switch Fuel Trim At Limit (Ford)

P1151

Lack Of HO2S-21 Switch Indicates Lean (Ford)

P1152

Lack Of HO2S-21 Switch Indicates Rich (Ford)

P1153

Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1 (Front Bank)

P1154

Heated Oxygen Sensor (HO2S) transition time ratio bank 2 sensor 1 (Front Bank)

P1157

Lack Of HO2S-22 Switch Indicates Lean (Ford)

P1158

Lack Of HO2S-22 Switch Indicates Rich (Ford)

P1168

FRP Sensor In Range But Low (Ford)

P1169

FRP Sensor In Range But High (Ford)

P1180

Fuel Delivery System Low (Ford)

P1181

Fuel Delivery System High (Ford)

P1183

EOT Sensor Circuit Malfunction (Ford)

P1184

EOT Sensor Out Of Range (Ford)

P1189

Engine Oil Pressure Switch Circuit

P1192

Inlet Air Temp. Circuit Low (Chrysler)

P1193

Inlet Air Temp. Circuit High (Chrysler)

P1195

1/1 O2 Sensor Slow During Catalyst Monitor (Chrysler)

P1196

2/1 O2 Sensor Slow During Catalyst Monitor (Chrysler)

P1197

1/2 O2 Sensor Slow During Catalyst Monitor (Chrysler)

P1198

Radiator Temperature Sensor Volts Too High (Chrysler)

P1199

Radiator Temperature Sensor Volts Too Low (Chrysler)

Upstream O2 Sensors Swapped Bank To Bank

Description:

How does a P0040 code trigger the check engine light? This code will trigger the light to come on under the following condition:

The Heated Oxygen Sensor Monitor, a strategy built into the computer, determines if the Heated Oxygen Sensor (HO2S) signal response for a change in fuel trim corresponds to the correct engine bank. If a response from the Oxygen Sensor being tested is not indicated, a trouble code will be set and the MIL (Malfunction Indicator Lamp) will illuminate.

Possible Causes:

Crossed Heated Oxygen Sensor harness connectors
Wiring swapped from one Oxygen Sensor connector to the other
Wiring changed at the computer connection or in the related harness

Diagnostic Help:

This check engine light code is caused by swapped wiring or connectors of the upstream Heated Oxygen Sensors. This would have to be the result of a previous repair, so be sure to check the vehicle history. You may also use the “Get Help” link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instructions.

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