Engine-Codes - Generic - P1137

P1137 - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1137 Possible Causes

  • Exhaust gas leaks
  • Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1
  • Heated Oxygen Sensor 2 Bank 1 harness is open or shorted
  • Heated Oxygen Sensor 2 Bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors

How is the P1137 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1137 code

Labor: 1.0

The cost to diagnose the P1137 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
How much do you know about cars?

Take the AutoCodes.com automotive tests and turbo-charge your car repair knowledge

Play Now

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1137 Meaning

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air-fuel mixture (air-fuel ratio) must maintain near the ideal stoichiometric ratio. The HO2S2 output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V. The P1137 code will set when the PCM detects that the HO2S2 signal is below the voltage of range for an extended period.

More Information

Need more information on how to fix the P1137 code?
Get Access to Factory Service Manuals

Information for specific makes

  • P1137 AUDI Long Term Fuel Trim Add. Fuel B1 System Too Rich
  • P1137 BMW O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2
  • P1137 BUICK HO2S Circuit Low Voltage Sensor 2
  • P1137 CADILLAC HO2S Bank 1 Sensor 2 Lean Or Low Voltage
  • P1137 CHEVROLET HO2S Bank 1 Sensor 2 Lean System or Low Voltage  
  • P1137 FORD Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean  
  • P1137 GMC HO2S Bank 1 Sensor 2 Lean System or Low Voltage
  • P1137 INFINITI Swirl Control Valve Control Position Sensor Circuit
  • P1137 ISUZU HO2S 1 Rich Condition HO2S 2 Lean Condition
  • P1137 LINCOLN Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean  
  • P1137 MAZDA Rear O2 Sensor Self Test Fault
  • P1137 MERCURY Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean  
  • P1137 MINI O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2
  • P1137 NISSAN Swirl Control Valve Control Position Sensor Circuit
  • P1137 PONTIAC HO2S Bank 1 Sensor 2 Lean Or Low Voltage
  • P1137 SATURN HO2S Bank 1 Sensor 2 Lean Or Low Voltage
  • P1137 SUBARU Oxygen Sensor Circuit Bank 1 Sensor 1  
  • P1137 SUZUKI HO2S Circuit Low Voltage During Power Enrichment Sensor 2
  • P1137 VOLKSWAGEN Long Term Fuel Trim Add. Fuel B1 System Too Rich

Need more help?

Get the P1137 code diagnosed by a professional: Find a repair shop in your area