Technical Definition:

O2 Circuit High Voltage (Bank 1, Sensor 2)

Technical Description:

The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter.

Possible Causes:

• Faulty O2 sensor
• Short to battery voltage in O2 sensor signal circuit
• High fuel pressure

Possible Symptoms:

O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Possible Solutions:

• Replace O2 sensor
• Repair short to battery voltage in o2 sensor signal circuit

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Rear Heated Oxygen Sensor Bank 1
– Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
– Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Intake air leaks
– Exhaust gas leaks
– Inappropriate fuel pressure
– Faulty fuel injectors

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

O2 Circuit High Voltage (Bank 1, Sensor 1)

Technical Description:

Possible Causes:

Possible Symptoms:

O2 Sensor Circuit High Voltage Bank 1 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

O2 Circuit Slow Response (Bank 1, Sensor 1)

Technical Description:

That means it’s definition is the same for all makes and models of OBD-II vehicles, however specific repair steps may vary depending on the vehicle. This trouble code involves the front oxygen sensor on Bank 1.

Possible Causes:

• The oxygen sensor is faulty
• The wiring to the sensor is broken / frayed
• There is an exhaust leak

Possible Symptoms:

O2 Sensor Circuit Slow Response Bank 1 Sensor 1

Possible Solutions:

• Check and fix any exhaust leaks
• Check for wiring problems
• Check the frequency and amplitude of the oxygen sensor
• Check for a deteriorating / contaminated oxygen sensor, replace if necessary
• Check for inlet air leaks
• Check the MAF sensor for proper operation

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

O2 Circuit No Activity Detected (Bank 1, Sensor 1)

Technical Description:

This code refers to the front oxygen sensor on Bank 1. Basically the oxygen sensor is inactive.

Possible Causes:

• Bad O2 (oxygen) sensor
• Bad heater circuit in the O2 sensor
• Wiring or connector to the sensor frayed / broken
• Blown heater circuit fuse
• Holes in the exhaust system
• PCM failure

Possible Symptoms:

O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1

Possible Solutions:

• Rusted exhaust pipe
• Inspect wiring & connector(s) for problems
• Excessive amperage blowing heater fuse
• Replace PCM.

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

O2 Circuit (Bank 1, Sensor 1)

Technical Description:

Possible Causes:

Possible Symptoms:

O2 Sensor Circuit Malfunction Bank 1 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

O2 Circuit Low Voltage (Bank 1, Sensor 1)

Technical Description:

Possible Causes:

Possible Symptoms:

O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Technical Definition:

Barometric Pressure (BARO) Too Low

Technical Description:

Possible Causes:

Possible Symptoms:

Barometric Pressure Out Of Range Low

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Manifold Absolute Pressure (MAP) sensor
– Manifold Absolute Pressure (MAP) sensor harness open or shorted
– Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection

Specific Makes:

Technical Definition:

Insufficient Coolant Temperature for Stable Operation

Technical Description:

Possible Causes:

Possible Symptoms:

Insufficient Coolant Temperature for Stable Operation

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low engine coolant level
– Leaking or stuck open thermostat
– Faulty Engine Coolant Temperature (ECT) sensor
– Engine Coolant Temperature (ECT) sensor harness is open or shorted
– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

Specific Makes:

Technical Definition:

Intake Air Temperature Too High

Technical Description:

Possible Causes:

Possible Symptoms:

Intake Air Temperature Too High

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Intake Air Temperature (IAT) sensor
– Intake Air Temperature (IAT) sensor harness is open or shorted
– Intake Air Temperature (IAT) sensor electrical circuit poor connection

Specific Makes:

Technical Definition:

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Technical Description:

Possible Causes:

Possible Symptoms:

Coolant Thermostat Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Leaking or stuck open thermostat
– Low engine coolant level
– Insufficient warm up time
– Faulty engine coolant temperature sensor
– Engine coolant temperature sensor harness is open or shorted
– Engine coolant temperature sensor circuit poor electrical connection

Specific Makes:

Technical Definition:

Throttle / Pedal Position Sensor / Switch A Circuit Low

Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

Technical Definition:

Throttle / Pedal Position Sensor / Switch A Circuit High

Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

Technical Definition:

Throttle / Pedal Position Sensor / Switch A Circuit Intermittent

Technical Description:

Possible Causes:

Possible Symptoms:

Throttle Position Sensor/Switch A Circuit Intermittent

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty throttle position sensor.
– Throttle position sensor harness is open or shorted
– Throttle position sensor circuit poor electrical connection

Specific Makes:

Technical Definition:

Insufficient Coolant Temperature for Closed Loop Fuel Control

Technical Description:

Possible Causes:

Possible Symptoms:

Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Low engine coolant level
– Leaking or stuck open thermostat
– Faulty Engine Coolant Temperature (ECT) sensor
– Engine Coolant Temperature (ECT) sensor harness is open or shorted
– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

Specific Makes: