P0138 Isuzu Code - HO2S Circuit Low Voltage Sensor 2
Quick Answer
The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), 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 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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
- P0138 Isuzu indicates HO2S Circuit Low Voltage Sensor 2.
- Common causes
- Common causes include 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.
- 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 P0138 Isuzu Description
What are the Possible Causes of the DTC P0138 Isuzu?
- 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
- Intake air leaks
- Exhaust gas leaks
- Inappropriate fuel pressure
- Faulty fuel injectors
How to Fix the DTC P0138 Isuzu?
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 P0138 Isuzu 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 P0138 Isuzu Code
1. What does the OBDII code P0138 for Isuzu HO2S Circuit Low Voltage Sensor 2 indicate?
- This code indicates that the oxygen sensor (O2 sensor) in bank 1 sensor 2 is registering a low voltage condition.
2. What are the common symptoms of a P0138 code in an Isuzu vehicle?
- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.
3. What are the possible causes of a P0138 code in an Isuzu vehicle?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust system leaks, and engine misfires.
4. How can I diagnose a P0138 code in my Isuzu vehicle?
- Diagnosing a P0138 code involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related wiring, and checking for exhaust leaks.
5. Can a P0138 code be fixed by simply replacing the oxygen sensor?
- In some cases, replacing the oxygen sensor may resolve the P0138 code. However, it's important to diagnose the issue accurately before replacing any parts.
6. Are there any repair tips for addressing a P0138 code in an Isuzu vehicle?
- Repair tips include ensuring proper installation of the oxygen sensor, checking for exhaust leaks, and verifying the integrity of the wiring harness.
7. How critical is it to address a P0138 code promptly in an Isuzu vehicle?
- While the vehicle may still be operable with a P0138 code, it's important to address it promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
8. Can I drive my Isuzu vehicle with a P0138 code?
- It is generally safe to drive your Isuzu vehicle with a P0138 code, but it is recommended to address the issue as soon as possible to avoid further complications.
9. What is the typical cost to repair a P0138 code in an Isuzu vehicle?
- The cost of repairing a P0138 code can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.
10. Is it possible to reset the check engine light after fixing a P0138 code in an Isuzu vehicle?
- Yes, the check engine light can be reset using an OBDII scanner after fixing the underlying issue causing the P0138 code.
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