P1148 2003 Infiniti G35 Code - Closed Loop Control Function Bank 1
Quick Answer
The Engine Control Module (ECM) performs ON/OFF duty control of the Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 heater corresponding to the engine operating condition to keep the temperature of Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 element at the specified range. Common causes include Faulty Heated Oxygen Sensor 1 Bank 1, Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted, Heated Oxygen Sensor 1 Bank 1 circuit electrical connection. 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
- P1148 2003 Infiniti G35 indicates Closed Loop Control Function Bank 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor 1 Bank 1, Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted, Heated Oxygen Sensor 1 Bank 1 circuit electrical connection.
- 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 P1148 2003 Infiniti G35 Description
What are the Possible Causes of the DTC P1148 2003 Infiniti G35?
- Faulty Heated Oxygen Sensor 1 Bank 1
- Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted
- Heated Oxygen Sensor 1 Bank 1 circuit electrical connection
How to Fix the DTC P1148 2003 Infiniti G35?
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 P1148 2003 Infiniti G35 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.
Need more information about the P1148 2003 Infiniti G35 code?
Need more information on how to fix the P1148 2003 Infiniti G35 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1148 2003 Infiniti G35 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1148 2003 Infiniti G35 Code
1. What does the OBDII code P1148 mean for a 2003 Infiniti G35?
P1148 indicates a problem with the closed-loop fuel control system for Bank 1, typically caused by an issue with the air-fuel ratio (A/F) sensor or its circuit.
2. What are common symptoms of the P1148 code on a 2003 Infiniti G35?
Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the check engine light being illuminated.
3. What causes the P1148 code to appear?
The most common causes are a faulty air-fuel ratio (A/F) sensor, damaged sensor wiring, a malfunctioning engine control module (ECM), or exhaust leaks affecting sensor readings.
4. Can I drive my 2003 Infiniti G35 with the P1148 code?
While the car may still be drivable, it is not recommended as it can lead to reduced performance, increased emissions, and potential damage to other components like the catalytic converter.
5. How is the P1148 code diagnosed on a 2003 Infiniti G35?
A mechanic will use an OBDII scanner to read the code, check the air-fuel ratio sensor and its wiring for issues, and verify fuel control system operation.
6. How do I fix the P1148 code on my Infiniti G35?
Repairs typically involve replacing the faulty air-fuel ratio (A/F) sensor, repairing damaged wiring, or addressing exhaust leaks. In rare cases, the ECM may need reprogramming or replacement.
7. How much does it cost to repair a P1148 code on a 2003 Infiniti G35?
A replacement A/F sensor typically costs $150–$300 for parts, with additional labor costs ranging from $50–$150 depending on the shop.
8. Can a dirty air filter cause the P1148 code?
While unlikely, a severely clogged air filter can contribute to improper air-fuel ratios, which might indirectly affect sensor performance.
9. Is the P1148 code specific to Bank 1?
Yes, P1148 refers to closed-loop control issues specifically on Bank 1, which is the side of the engine containing cylinder 1.
10. How can I prevent the P1148 code from recurring?
Regularly inspect and maintain your air-fuel ratio sensors, ensure proper engine tune-ups, and promptly repair exhaust leaks to prevent future issues.
Discuss the causes and fixes for P1148 2003 Infiniti G35 OBDII Code
Code P1148 2003 Infiniti G35 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.
