Closed Loop Control (Bank 2)

What it means

This is a Nissan-specific code; the same number can mean something different on other makes. It appears on two-bank engines (V6 and V8) and means the engine computer could not control the fuel mixture on bank 2 using that bank's front oxygen sensor. Bank 2 is the side without cylinder 1, and the code is usually accompanied by that bank's sensor codes.

Models covered: Nissan V6/V8 models, mainly around 1996–2003.

Related codes: P0150P0153P0154P0155P1148

Symptoms4

• Check engine light on.
• A slight rise in fuel consumption.
• Driving usually feels normal with no noticeable symptoms.
• P1148 may appear too if the cause is shared by both banks.

Possible causes5

• A slow or failed bank 2 front oxygen sensor.
• A faulty sensor heater or heater circuit.
• A damaged wire or connector; on V6 engines this sensor's wiring often runs near hot parts.
• An exhaust manifold or joint leak ahead of the bank 2 sensor.
• An engine that does not reach operating temperature due to the thermostat, which usually affects both banks.

How to diagnose5

1. Identify bank 2 on your engine from the service manual before testing, so the wrong sensor is not replaced.
2. Read all codes and start with bank 2 sensor codes such as P0150, P0153 or P0155.
3. Watch both banks' sensor signals on a scan tool; a healthy sensor switches quickly, a slow one looks almost flat.
4. Inspect the sensor wiring and connector for melting or chafing.
5. Check the bank 2 exhaust manifold for cracks or leaks.

How to fix5

1. Repair damaged wiring or the connector and secure the wiring away from hot parts.
2. Repair the bank 2 exhaust leak.
3. Replace the thermostat if the code appears on both banks and the engine does not warm up properly.
4. Replace the bank 2 front O2 sensor if it is confirmed slow or its heater has failed.
5. Clear the codes and drive until the self-test completes, then confirm the code does not return.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low when a wire or connector is the cause, and rises when the O2 sensor is replaced, especially if reaching it on a V6 takes more labor.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions