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P2A03 Cadillac Code - O2 Sensor Performance Bank 2 Sensor 1

- Code Popularity: 1,003 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By - Updated Aug 12, 2020
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|Code P2A03 Cadillac Possible Causes

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

|How do I Fix the Code P2A03 Cadillac?

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 connector's pins.

Does your Cadillac have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code P2A03 Cadillac?

Labor: 1.0

The cost of diagnosing the P2A03 Cadillac 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.

|What are Code P2A03 Cadillac Possible Symptoms?

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

|Code P2A03 Cadillac Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The control module supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started the control module operates in an open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream; low HO2S voltage indicates a lean exhaust stream. The Diagnostic Trouble Code (DTC) will set when the control module detects that the Loop Status parameter is open.

OBDII Code P2A03 Cadillac - O2 Sensor Performance Bank 2 Sensor 1 -
P2A03 Cadillac Code - O2 Sensor Performance Bank 2 Sensor 1

|Need More Information on the P2A03 Cadillac Code?

Need more information on how to fix the P2A03 Cadillac code? Get Access to Factory Service Manuals

|Need Help with the P2A03 Cadillac Code?

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|Code P2A03 Cadillac comments

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