For Shop Owners

P2A01 - O2 Sensor Circuit Range/Performance Bank 1 Sensor 2

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

Possible causes

  • Faulty Rear Heated Oxygen Sensor Bank 1
  • Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks
What does this mean?

Tech notes

Replacing the rear O2 Sensor bank 1 usually takes care of the problem.
What does this mean?

Possible symptoms

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

P2A01 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 P2a01 - O2 Sensor Circuit Range/Performance Bank 1 Sensor 2 -

P2A01 Information for specific makes

P2A01 BUICK O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 CADILLAC O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 DODGE O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 FORD Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 GMC O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 LINCOLN Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 2
P2A01 MERCURY Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 2

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P2A01 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 02-16-2017

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