For Shop Owners

P0161 BMW - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

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
  • Exhaust gas leaks
What does this mean?

Tech notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.
What does this mean?

When is the code detected?

Current amperage in the rear heated oxygen sensor heater circuit is out of the normal range.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible higher than usual fuel consumption

P0161 BMW 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 P0161 Bmw - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 2 - itimaster.ru

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P0161 BMW Comments

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Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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