P0158 Cadillac Code - HO2S Circuit High Voltage Bank 2 Sensor 2
Quick Answer
The P0158 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage for Bank 2 Sensor 2. Common causes include Faulty HO2S in Bank 2 Sensor 2, Wiring harness issues, such as shorts or open circuits, Exhaust leaks near the sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0158 Cadillac indicates HO2S Circuit High Voltage Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty HO2S in Bank 2 Sensor 2, Wiring harness issues, such as shorts or open circuits, Exhaust leaks near the sensor.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0158 Cadillac Description
The P0158 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage for Bank 2 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. Bank 2 Sensor 2 specifically refers to the sensor located downstream of the catalytic converter on the side of the engine with cylinder 2.
Common Causes of P0158 Cadillac
- Faulty HO2S in Bank 2 Sensor 2
- Wiring harness issues, such as shorts or open circuits
- Exhaust leaks near the sensor
- ECM software or hardware problems
- Engine running rich due to issues with fuel injectors or air intake system
Symptoms of P0158 Cadillac
- Decreased fuel efficiency
- Check Engine Light illuminated
- Rough idling or engine misfires
- Failed emissions test
- Reduced engine performance
How to Fix P0158 Cadillac
- Begin by conducting a visual inspection of the wiring harness and sensor for any visible damage or corrosion.
- Use a multimeter to test the voltage output of the HO2S in Bank 2 Sensor 2 to determine if it is reading abnormally high.
- If the sensor is faulty, replace it with a new OEM or high-quality aftermarket sensor.
- Clear the DTC from the ECM memory using a scan tool and test drive the vehicle to ensure the code does not return.
- If the issue persists, further diagnostics may be required to identify underlying problems with the wiring, ECM, or other components.
Cost to Fix P0158 Cadillac
The cost of repairing a P0158 DTC can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing a faulty HO2S sensor can cost between $100 and $300 for the part alone. Labor costs at an auto repair shop can range from $100 to $300, with total repair costs typically falling between $200 and $600. It's important to note that additional diagnostic time may be needed to pinpoint the exact cause of the code, so the final cost could be higher. Be sure to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's make and model.
Tech Notes for P0158 Cadillac
Need more information about the P0158 Cadillac code?
Need more information on how to fix the P0158 Cadillac code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0158 Cadillac code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0158 Cadillac Code
No Frequently Asked Questions about P0158 Cadillac Code found.
Discuss the causes and fixes for P0158 Cadillac OBDII Code
Code P0158 Cadillac comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.