P2A02 - O2 Sensor Circuit Range/Performance Bank 1 Sensor 3
P2A02 Possible Causes
- Faulty O2 Sensor Bank 1 Sensor 3
- Faulty O2 Sensor Bank 1 Sensor 3 harness is open or shorted
- Faulty O2 Sensor Bank 1 Sensor 3 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
First diagnose P2A02 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.
Cost of diagnosing the P2A02 code
Labor: 1.0The cost of diagnosing the P2A02 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.
P2A02 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2a02 DescriptionThe heated oxygen sensor 3 (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.
P2A02 More InformationNeed more information on how to fix the P2A02 code?
Get Access to Factory Service Manuals
P2A02 Information for specific makes
- P2A02 DODGE O2 Sensor Circuit Range/Performance Bank 1 Sensor 3
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