P1151 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
- Faulty Upstream Oxygen Sensor Bank 2
- Fuel pressure high or low
- MAF sensor dirty/defective
- Vacuum leak on engine
- Leaking fuel injector or fuel pressure regulator
- Faulty Powertrain Control Module (PCM)
- Engine Light ON (or Service Engine Soon Warning Light)
The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. Input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Inlet Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP) and Crankshaft Position (CKP) sensors to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is enabled.
• The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function.
• Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage.
• A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by
measuring the current going through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.
P1151 Information for specific makes
P1151 BMW O2 Sensor Heater Circuit Signal Intermittent Bank 2 Sensor 1
P1151 CHRYSLER Fuel Rail Pressure Malfunction Maximum Positive Deviation
P1151 DODGE Fuel Rail Pressure Malfunction Maximum Positive Deviation
P1151 FORD Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
P1151 HYUNDAI Electronic Throttle System Main Accel Position Sensor 2 Malfunction
P1151 JEEP Fuel Rail Pressure Malfunction Maximum Positive Deviation
P1151 LINCOLN Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
P1151 MAZDA HO2S-21 Lean Condition Correcting For Over Rich Condition
P1151 MERCURY Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
P1151 MINI O2 Sensor Heater Circuit Signal Intermittent Bank 2 Sensor 1
P1151 SUBARU Rear Oxygen Sensor Heater Circuit High Input
P1151 SUZUKI HO2S21 Circuit Low Voltage Shift/High Voltage Shift/Circuit Continuity/High Voltage
P1151 VOLKSWAGEN Bank 1 Long Term Fuel Trim Range 1 Lean Lower Limit Exceeded