P1138 Isuzu Code - HO2S 2 Voltage Stays High Rich Condition
Quick Answer
P1138 Isuzu indicates HO2S 2 Voltage Stays High Rich Condition. Common causes include Leaking injector or regulator, Engine ignition misfire, Engine mechanical condition. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1138 Isuzu indicates HO2S 2 Voltage Stays High Rich Condition.
- Common causes
- Common causes include Leaking injector or regulator, Engine ignition misfire, Engine mechanical condition.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1138 Isuzu Description
What are the Possible Causes of the DTC P1138 Isuzu?
- Leaking injector or regulator
- Engine ignition misfire
- Engine mechanical condition
- Faulty HO2S
- HO2S Sensor 2 harness is open or shorted
- HO2S Sensor 2 circuit poor electrical connection
How to Fix the DTC P1138 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1138 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 P1138 Isuzu Code
1. What does OBDII code P1138 mean for an Isuzu?
P1138 indicates that the downstream oxygen sensor (HO2S 2) is detecting a consistently high voltage, suggesting a rich air-fuel mixture.
2. What are the common symptoms of code P1138 in an Isuzu?
Symptoms may include poor fuel economy, rough idling, black smoke from the exhaust, and an illuminated check engine light.
3. What causes the P1138 code to be triggered?
Common causes include a faulty oxygen sensor, a leaking fuel injector, a malfunctioning fuel pressure regulator, or an exhaust leak near the sensor.
4. Can a dirty air filter cause a P1138 code?
Yes, a dirty air filter can restrict airflow, contributing to a rich condition and triggering the P1138 code.
5. How do I diagnose the P1138 code on an Isuzu?
Start by checking the oxygen sensor and its wiring, inspect for exhaust leaks, and test the fuel injectors and fuel pressure regulator for proper operation.
6. Can a faulty HO2S 2 oxygen sensor cause the P1138 code?
Yes, a malfunctioning downstream oxygen sensor can give false readings, causing the P1138 code.
7. Is it safe to drive with the P1138 code active?
Driving with this code can lead to poor fuel economy and potential damage to the catalytic converter if the rich condition persists.
8. How is the P1138 code fixed on an Isuzu?
Repairs may include replacing the oxygen sensor, fixing exhaust leaks, cleaning or replacing the air filter, or repairing fuel system components.
9. How much does it cost to repair the P1138 code?
The repair cost depends on the issue, ranging from $100-$300 for a new oxygen sensor to more for fuel system repairs.
10. Can a bad catalytic converter trigger the P1138 code?
While unlikely, a failing catalytic converter could influence downstream oxygen sensor readings, contributing to this code.
Discuss the causes and fixes for P1138 Isuzu OBDII Code
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