P0157 Mitsubishi Code - Cylinder 2-3 Heated Oxygen Rear Sensor Circuit Low Voltage
Quick Answer
The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include 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. 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
- P0157 Mitsubishi indicates Cylinder 2-3 Heated Oxygen Rear Sensor Circuit Low Voltage.
- Common causes
- Common causes include 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.
- 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.
Code P0157 Mitsubishi Description
What are the Possible Causes of the DTC P0157 Mitsubishi?
- 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 may be faulty
- Exhaust gas leaks
How to Fix the DTC P0157 Mitsubishi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0157 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0157 Mitsubishi Code
1. What does the OBDII code P0157 mean for a Mitsubishi?
Code P0157 indicates that the rear heated oxygen sensor for cylinders 2-3 is reporting low voltage, suggesting a possible issue with the sensor or its circuit.
2. What are the common symptoms of code P0157 in a Mitsubishi?
Symptoms may include poor fuel economy, rough idling, a check engine light, and potentially increased emissions.
3. What causes the P0157 code in a Mitsubishi?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks near the sensor, or an issue with the vehicle’s PCM.
4. Can driving with code P0157 damage my Mitsubishi?
While it may not cause immediate damage, prolonged driving with this code can negatively impact fuel efficiency and emissions, potentially leading to more serious engine issues.
5. How do I diagnose code P0157 on a Mitsubishi?
Start by inspecting the oxygen sensor and its wiring for damage. Use a multimeter to test the sensor voltage and confirm if the sensor is functioning properly.
6. How can I fix the P0157 code in a Mitsubishi?
Repairs may include replacing the oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or reprogramming the PCM if necessary.
7. How much does it cost to fix the P0157 code in a Mitsubishi?
Repair costs can vary, but replacing the oxygen sensor typically costs $150–$300, depending on labor rates and parts.
8. Can a dirty air filter cause a P0157 code in a Mitsubishi?
While unlikely, a dirty air filter can affect overall engine performance, which may indirectly contribute to issues with the oxygen sensor.
9. Do I need a professional mechanic to fix code P0157 in a Mitsubishi?
If you have basic automotive knowledge and tools, you might be able to replace the oxygen sensor yourself. Otherwise, it’s recommended to consult a professional mechanic.
10. Can a bad catalytic converter trigger code P0157 in a Mitsubishi?
Yes, a malfunctioning catalytic converter can affect oxygen sensor readings and potentially trigger this code.
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