P0135 - HO2S Sensor Circuit Malfunction (HO2S-11)
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P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
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If this were my car I would be checking for power's and grounds (5 volt and 12 volt) to the O2's and DPFE sensor. Verify that the O2 heaters actually work. Verify that the O2 sensor signal is switching.
Do you have an ODB2 scanner? If so, this could make short work of your problem. Here's some information on an affordable ($30) Windows based unit.
ForScan ODB2 scanner w ELM327 USB
ForScan ODB2 scanner w ELM327 USB
While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...www.stangnet.com
P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
- Electrical:
- Short to VPWR in harness or HO2S
- Water in harness connector
- Open/Shorted HO2S circuit
- Corrosion or poor mating terminals and wiring
- Damaged HO2S
- Damaged PCM
- Fuel System:
- Excessive fuel pressure
- Leaking/contaminated fuel injectors
- Leaking fuel pressure regulator
- Low fuel pressure or running out of fuel
- Vapor recovery system
- Induction System:
- Air leaks after the MAF
- Vacuum Leaks
- PCV system
- Improperly seated engine oil dipstick
- EGR System:
- Leaking gasket
- Stuck EGR valve
- Leaking diaphragm or EVR
- Base Engine:
- Oil overfill
- Cam timing
- Cylinder compression
- Exhaust leaks before or near the HO2S(s)