P1166 2004 Infiniti G35 Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 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 heated oxygen (O2) sensor 2 (rear), Intake air leaks, Heated oxygen (O2) sensor 2 (rear) harness is open or shorted. 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
- P1166 2004 Infiniti G35 indicates Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2.
- Common causes
- Common causes include Faulty heated oxygen (O2) sensor 2 (rear), Intake air leaks, Heated oxygen (O2) sensor 2 (rear) harness is open or shorted.
- 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 P1166 2004 Infiniti G35 Description
What are the Possible Causes of the DTC P1166 2004 Infiniti G35?
- Faulty heated oxygen (O2) sensor 2 (rear)
- Intake air leaks
- Heated oxygen (O2) sensor 2 (rear) harness is open or shorted
- Heated oxygen (O2) sensor 2 (rear) circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
How to Fix the DTC P1166 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1166 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 P1166 2004 Infiniti G35 Code
1. What does the OBDII code P1166 mean on a 2004 Infiniti G35?
P1166 indicates an issue with the Heated Oxygen Sensor 2 (Bank 2) where the sensor's voltage is below the expected minimum level during operation.
2. What are the symptoms of code P1166 in a 2004 Infiniti G35?
Symptoms may include poor fuel efficiency, rough idling, a noticeable drop in engine performance, and the check engine light illuminating.
3. What causes the P1166 code to trigger on a 2004 Infiniti G35?
Common causes include a faulty Heated Oxygen Sensor 2 (Bank 2), wiring or connector issues, exhaust leaks, or a problem with the engine control module (ECM).
4. Which oxygen sensor is affected by the P1166 code on a 2004 Infiniti G35?
The code relates to Heated Oxygen Sensor 2 in Bank 2, which is located after the catalytic converter on the side of the engine opposite Cylinder 1.
5. Can a dirty or clogged catalytic converter cause the P1166 code?
Yes, a clogged or malfunctioning catalytic converter can affect the readings of the downstream oxygen sensor and potentially trigger the P1166 code.
6. How do you diagnose the P1166 code on a 2004 Infiniti G35?
Diagnosis involves checking the oxygen sensor voltage readings with a scan tool, inspecting the sensor and its wiring for damage, and checking for exhaust leaks or other related issues.
7. How do you fix the P1166 code on a 2004 Infiniti G35?
Repairs may include replacing the faulty oxygen sensor, fixing damaged wiring or connectors, addressing exhaust leaks, or replacing the catalytic converter if necessary.
8. Is it safe to drive with the P1166 code on a 2004 Infiniti G35?
While it may be possible to drive with this code, it is not recommended as it can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.
9. How much does it cost to repair the P1166 code on a 2004 Infiniti G35?
Repair costs vary but typically range from $150 to $300 to replace the oxygen sensor, plus additional costs if wiring repairs or other components like the catalytic converter need replacement.
10. Can a faulty ECM cause the P1166 code on a 2004 Infiniti G35?
While rare, a malfunctioning ECM can cause inaccurate monitoring of the oxygen sensor voltage, leading to the P1166 code. This should be considered after ruling out other causes.
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