Lack of HO2S Switch -- Adaptive Fuel at Limit -- Bank 2 (Ford)
What does P1150 mean?
The P1150 code means the vehicle's onboard diagnostic system has detected: Lack of HO2S Switch -- Adaptive Fuel at Limit -- Bank 2 (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor fuel economy
- Engine hesitation or stumble
- Rough idle
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Vacuum leak on bank 2 side of intake Very High
- Faulty front oxygen sensor -- bank 2 High
- Exhaust leak before front O2 sensor -- bank 2 Moderate
- Low fuel pressure Moderate
- Clogged fuel injector on bank 2 Low
Step-by-Step Diagnostic Procedure
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Check for vacuum leaks on bank 2 side of intake system
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Monitor fuel trim data on bank 2 with a scan tool
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Test front oxygen sensor on bank 2 for proper switching
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Check fuel pressure at idle and under load
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Inspect exhaust manifold on bank 2 for leaks
Frequently Asked Questions
Can I drive with code P1150?
You can drive short distances. The fuel system on bank 2 has reached its correction limit. Extended driving may cause catalytic converter overheating.
What causes P1150?
This is the bank 2 equivalent of P1130. Vacuum leaks and oxygen sensor failures are the most common causes. On Ford V8 engines, check for intake manifold runner control issues.
Should I replace both oxygen sensors if I have P1130 and P1150?
Not necessarily. If both codes are present, look for a common cause like low fuel pressure or a large vacuum leak that affects both banks. Only replace sensors that test as faulty.