Possible causes – Faulty HO2S Bank 1 Sensor 1– HO2S Bank 1 Sensor 1 harness is open or shorted– HO2S Bank 1 Sensor 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty HO2S11– Faulty Mass Air Flow (MAF) sensor– Fuel system malfunction– HO2S11 harness is open or shorted– HO2S11 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Idle Air Control (IAC) valve– Idle Air Control (IAC) valve harness is open or shorted– Idle Air Control (IAC) valve circuit poor electrical connection Tech notes The P1506 code means that the engine idle is out

Possible causes – Faulty Injection Control Pressure (ICP) sensor – Injection Control Pressure (ICP) sensor harness is open or shorted– Injection Control Pressure (ICP) sensor circuit poor electrical connection– EGR system fault– Engine mechanical condition Tech notes There is a

Possible causes – Faulty Injection Control Pressure (ICP) sensor – Injection Control Pressure (ICP) sensor harness is open or shorted– Injection Control Pressure (ICP) sensor circuit poor electrical connection– EGR system fault– Engine mechanical condition Tech notes There is a

Possible causes – Faulty Intake Air Temperature (IAT) Sensor– Intake Air Temperature (IAT) Sensor harness is open or shorted– Intake Air Temperature (IAT) Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1109

Possible causes – Faulty Intake Air Temperature Sensor– Intake Air Temperature Sensor harness is open or shorted– Intake Air Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1112 FORD Description The

Possible causes – Faulty Intake Air Temperature Sensor– Intake Air Temperature Sensor harness is open or shorted– Intake Air Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1115 FORD Description The

Possible causes – Faulty Intake Air Temperature Sensor– Intake Air Temperature Sensor harness is open or shorted– Intake Air Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1114 FORD Description The

Possible causes – Faulty Intake Manifold Runner Control (IMRC) valve– Intake Manifold Runner Control (IMRC) harness is open or shorted– Intake Manifold Runner Control (IMRC) circuit poor electrical connectin Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Intake Manifold Runner Position Sensor/Switch– Intake Manifold Runner Position Sensor/Switch harness is open or shorted– Intake Manifold Runner Position Sensor/Switch circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2015

Possible causes – Faulty Manifold Absolute Pressure (MAP) sensor– Manifold Absolute Pressure (MAP) sensor harness is open or shorted– Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection When is the code detected? If the Powertrain Control Module (PCM) detects

Possible causes – Faulty Manifold Absolute Pressure (MAP) sensor– Manifold Absolute Pressure (MAP) sensor harness is open or shorted– Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1105

Possible causes – Faulty Mass Air Flow Sensor– Air leak before or after sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection When is the code detected? The Engine Control Module

Possible causes – Faulty Mass Air Flow Sensor– Air leak before or after sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection When is the code detected? The Engine Control Module

Possible causes – Faulty Mass Air Flow Sensor– Air leak before or after sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection When is the code detected? The Engine Control Module

Possible causes – Faulty O2 Sensor Bank 1 Sensor 2– O2 Sensor Bank 1 Sensor 2 harness is open or shorted– O2 Sensor Bank 1 Sensor 2 circuit poor electrical connection– Air leak near oxygen sensor When is the code

Possible causes – Faulty O2 Sensor Heaters– O2 Sensor Heaters harness is open or shorted– O2 Sensor Heaters circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1127 FORD Description The heated oxygen sensor

Possible causes – Faulty Oxygen Sensor– Fuel pressure high or low– MAF sensor dirty/defective– Vacuum leak on engine– Leaking fuel injector or fuel pressure regulator– Faulty Powertrain Control Module When is the code detected? ECM could not adjust fuel trim

Possible causes – Faulty Oxygen Sensor– Fuel pressure high or low– MAF sensor dirty/defective– Vacuum leak on engine– Leaking fuel injector or fuel pressure regulator– Faulty Powertrain Control Module Symptoms – Engine Light ON (or Service Engine Soon Warning Light)