P1148 2004 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 2004 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 2004 Infiniti G35 Description
What are the Possible Causes of the DTC P1148 2004 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 2004 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.
Code Tech Notes
2004 Infiniti G35 Factory Service Bulletin OBDII Code P1148
The bulletin suggests reprogramming the Engine Control Module (ECM) first before replacing any parts.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1148 2004 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.
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Frequently Asked Questions about P1148 2004 Infiniti G35 Code
1. What does the OBDII code P1148 mean on a 2004 Infiniti G35?
P1148 indicates an issue with the Closed Loop Control Function for Bank 1, often meaning the engine control module (ECM) has detected a problem with the oxygen sensor's ability to manage the air-fuel ratio.
2. What are the common symptoms of code P1148 on a 2004 Infiniti G35?
Typical symptoms include poor fuel economy, rough idling, reduced engine performance, and the illumination of the Check Engine Light.
3. What causes the P1148 code on a 2004 Infiniti G35?
Common causes include a faulty Bank 1 upstream oxygen sensor, issues with the wiring or connectors, a malfunctioning ECM, or an exhaust leak near the sensor.
4. Which sensor is related to the P1148 code on a 2004 Infiniti G35?
The P1148 code is linked to the Bank 1 upstream (pre-catalytic converter) oxygen sensor.
5. Can a dirty or clogged air filter trigger the P1148 code on a 2004 Infiniti G35?
While unlikely, a severely clogged air filter could alter the air-fuel mixture and contribute to similar issues, but the primary cause is typically sensor or wiring-related.
6. How do you diagnose the P1148 code on a 2004 Infiniti G35?
Diagnosis involves checking the oxygen sensor's functionality, inspecting the wiring and connectors for damage, and testing for any exhaust leaks near Bank 1.
7. How do you fix the P1148 code on a 2004 Infiniti G35?
Repairs may include replacing the Bank 1 upstream oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or reprogramming or replacing the ECM if necessary.
8. Can you drive a 2004 Infiniti G35 with the P1148 code?
While the car may still be drivable, it’s not recommended to ignore the issue, as it can lead to poor performance, reduced fuel efficiency, and potential long-term engine damage.
9. How much does it cost to fix the P1148 code on a 2004 Infiniti G35?
Replacing the oxygen sensor usually costs $150-$400, depending on parts and labor. Additional repairs for wiring or exhaust leaks may increase the cost.
10. Can a loose or corroded electrical connection cause the P1148 code on a 2004 Infiniti G35?
Yes, poor electrical connections to the oxygen sensor can disrupt its signal, causing the P1148 code to appear.
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