Lack of HO2S Switch -- Adaptive Fuel at Limit -- Bank 2 (Ford)
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.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
Manufacturer-specific code. P1150 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
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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
-
Check for vacuum leaks on bank 2 side of intake system
-
Monitor fuel trim data on bank 2 with a scan tool
-
Test front oxygen sensor on bank 2 for proper switching
-
Check fuel pressure at idle and under load
-
Inspect exhaust manifold on bank 2 for leaks
Common Fixes by Vehicle
What techs usually find when diagnosing P1150 on specific vehicles — tap your vehicle for the fix and the exact part:
1996-2004 Ford F-150/Expedition 4.6L/5.4L Easy DIY
P1150 O2 sensor heater Bank 1 on older Ford V8s is usually a blown O2 heater fuse or a failed upstream O2 sensor. Check fuse F2.22 in the under-hood box first. Bank 1 is the passenger side on these engines. Motorcraft DY-1178 is the OE upstream O2 sensor. Don't overlook a chafed O2 harness under the exhaust heat shield.
Labor: 45-60 min2000-2011 Ford Ranger/Explorer Easy DIY
Ranger and Explorer set P1150 when the Bank 1 upstream O2 sensor heater circuit opens. Test heater resistance at the sensor connector (should be 3-15 ohms depending on year). If resistance is infinite, replace the sensor. Also check ground G100 on the cylinder head -- corroded grounds here kill O2 heater operation.
Labor: 45 min2005-2014 Ford Mustang 4.0L/4.6L Easy DIY
On Mustang, P1150 is commonly the Bank 1 O2 sensor itself or a chafed wire near the exhaust manifold. Check the sensor harness for burn marks where it routes near the headers. An O2 socket and new sensor will get this done in 45 minutes. Motorcraft OE sensors last 2-3x longer than generic aftermarket on these cars.
Labor: 45 minFrequently 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.
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