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Engine-Codes – Generic – P1151

P1151 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2

Quick Answer

The diagnostic trouble code P1151 indicates a lack of activity in the upstream heated oxygen sensor (HO2S) on bank 2 of the engine. Common causes include Faulty upstream HO2S sensor on bank 2, Sensor wiring/connectivity issues, Contamination from oil or coolant leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1151 indicates Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2.
Common causes
Common causes include Faulty upstream HO2S sensor on bank 2, Sensor wiring/connectivity issues, Contamination from oil or coolant leaks.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P1151 Description

The diagnostic trouble code P1151 indicates a lack of activity in the upstream heated oxygen sensor (HO2S) on bank 2 of the engine. This sensor is responsible for measuring the oxygen content in the exhaust gases and providing this information to the engine control module (ECM) for optimal air-fuel ratio control. When the sensor indicates a lean condition, it means that there is an excess of oxygen in the exhaust gases, which can lead to a variety of performance issues.

OBDII Code P1151 - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
P1151 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2

Common Causes of P1151

  1. Faulty upstream HO2S sensor on bank 2
  2. Sensor wiring/connectivity issues
  3. Contamination from oil or coolant leaks
  4. Exhaust system leaks
  5. Engine vacuum leaks

Symptoms of P1151

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Hesitation during acceleration
  5. Illumination of the check engine light

How to Fix P1151

  1. Diagnose the issue by using a scan tool to verify the P1151 code and perform a visual inspection of the upstream HO2S sensor and its wiring.
  2. Replace the upstream HO2S sensor on bank 2 if it is found to be faulty. Ensure proper installation and secure wiring connections.
  3. Check for any exhaust system leaks or engine vacuum leaks that may be contributing to the lean condition and repair as necessary.
  4. Clear the diagnostic trouble codes from the ECM memory and perform a road test to verify that the issue has been resolved.

Cost to Fix P1151

The typical repair costs for addressing a lack of upstream HO2S sensor switch sensor indicating lean bank 2 can range from $200 to $500, including parts and labor. However, the specific cost may vary based on the location, vehicle make and model, and the labor rates of the auto repair shop. It is advisable to consult with a professional mechanic to get an accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P1151

The code means that the Powertrain Control Module (PCM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

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Code P1151 Information for Specific Makes

  • P1151 Audi — Bank 1 Long Term Fuel Trim Range 1 Lean Lower Limit Exceeded
  • 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 Lexus — Coolant Heat Storage Tank
  • 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 Toyota — Coolant Heat Storage Tank
  • P1151 Volkswagen — Bank 1 Long Term Fuel Trim Range 1 Lean Lower Limit Exceeded
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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