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P0156 1997 FORD F150

P0156 1997 FORD F150 - O2 Sensor Circuit Malfunction Bank 2 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3   
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P0156 1997 FORD F150 Possible Causes

  • Faulty Rear Heated Oxygen Sensor Bank 2
  • Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
  • Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks

First diagnose P0156 1997 FORD F150 code

    Check 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 terminals.

P0156 1997 FORD F150 Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.
The downstream HO2S sensor(s) are continuously checked for maximum and minimum voltages. The test fails when the voltages fail to meet the calibrated limits.

Cost of diagnosing the P0156 1997 FORD F150 code

    Labor: 1.0

    The cost of diagnosing the P0156 1997 FORD F150 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0156 1997 FORD F150 code detected?

The P0156 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage is out of range for an extended period of time.

P0156 1997 FORD F150 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

P0156 1997 Ford F150 Description

The heated oxygen sensor 2 (HO2S), after 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 be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S 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 ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.
OBDII Code P0156 1997 Ford F150 - O2 Sensor Circuit Malfunction Bank 2 Sensor 2 - AutoCodes.com

P0156 1997 FORD F150 More Information

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