Question about Ford Expedition
Won't pass emission because of the code 1151 want to know what cause it
P1151 Lack of HO2S21 Switches - Sensor Indicates Lean
Suspect that this is technical jargon for a faulty -O2 sensor ,Test them both with a multimulter for function .
Posted on Dec 06, 2012
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Posted on Jan 02, 2017
If it a diesel then you must be aware that when changing a filter and pump they must be full of fuel, otherwise it won't **** the fuel into the engine.
Posted on Jul 11, 2011
you need to hook to a scanner to find the system that is not ready to repair it properly, could be simple but ya need to have diagnosed.
Posted on Jan 20, 2010
DTC P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
Symptoms: You will likely not notice any drivability problems.
Causes: A code P1151 may mean that one or more of the following has happened:
* Short to VPWR in the harness or HO2S
* Water in the harness connector
* Open/shorted HO2S circuit
* Corrosion or poor mating terminals and wiring
* Damaged HO2S
* Damaged PCM
* Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
* Air leaks after the MAF
* Vacuum Leaks
* Improperly seated engine oil dipstick
* Leaking gasket
* Stuck EGR valve
* Leaking diaphragm or EVR
* Oil overfill
* Cam Timing
* Cylinder compression
* Exhaust leaks before or near the HO2S(s)
Possible Solutions: See the above list of causes and go from there.
Hope helps (remember comment and rated this).
Posted on Jul 19, 2010
You could have dirty injectors, a vacuum leak, faulty MAF sensor and/or a clogged catalytic converter. Most likely your 02 sensors were fine and didn't need to be replaced. Just because you have an sensor fault code does not mean the sensor is bad, in fact the majority of the time it's working just fine.
Posted on Jul 22, 2011
SOURCE: 2001 olds aurora drive cycle.
Hello and welcome to FixYa!
It is suggested you take it for a few runs. 25kms. atleast. After that, you can remove the positive battery connector and let it sit for atleast 5mins. before reconnecting.
Hope this helps and thank you for using FixYa! Have a good one!
Posted on Jul 28, 2011
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