Air/Fuel Sensor Circuit Range/Performance (Bank 2 Sensor 1)
What it means
This is a Toyota-specific code; the same number can mean something else on other makes. It appears only on V6 and V8 engines with two cylinder banks, and means the Bank 2 upstream air/fuel (A/F) sensor signal stayed stuck or out of the expected range. Bank 2 is the side that does not contain cylinder 1.
Models covered: Toyota models with air/fuel ratio (A/F) sensors, mainly model years around 1998–2004 (e.g. Camry, Corolla, RAV4, Highlander, Sienna, Tacoma, Tundra); later models use generic codes (P2195–P2198, P0031/P0032). Bank 2 exists on V6/V8 engines only.
Symptoms4
- Check engine light on.
- Higher fuel consumption.
- Slight rough idle in some cases.
- The driver may notice no change in performance.
Possible causes5
- Aged or contaminated Bank 2 A/F sensor.
- Exhaust manifold or joint leak ahead of the Bank 2 sensor.
- Air leak on the Bank 2 side of the intake manifold or vacuum hoses.
- Leaking or under-delivering injector on Bank 2.
- Heat-damaged sensor wiring, especially when the sensor sits at the rear of the engine.
How to diagnose5
- Compare fuel trims and both upstream sensor readings on a scan tool; if only Bank 2 is off, the cause is on that side.
- Watch the sensor reading change as you snap and release the throttle.
- Inspect the Bank 2 exhaust manifold for cracks or a leaking gasket.
- Check vacuum hoses and intake joints near Bank 2.
- Inspect the wiring and connector and compare voltages with the Toyota specification.
How to fix5
- Repair exhaust or air leaks on the Bank 2 side.
- Clean the injectors or replace a faulty one.
- Repair wiring or the connector.
- Replace the Bank 2 A/F sensor with a part matching the Toyota specification.
- Clear the codes and drive until the sensor monitor completes.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The sensor costs the same as on Bank 1, but labor can rise when it sits at the back of the engine and is hard to reach.
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
Why do I have P1150 but not P1130?
The fault is only on the Bank 2 side, either the sensor itself or an exhaust leak there. If both codes appear together, look for a shared cause such as fuel pressure or the MAF sensor.
Can a four-cylinder engine set this code?
No. An inline four-cylinder engine has only one bank, so P1150 appears on V6 and V8 engines only.
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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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