As i indicated before i have replaced the oxygen sensors but i continue to get "check engine" light and the trouble codes are PO171 and PO174. on occasion the car stalls after a long drive while in idle position.
I think I have the same code but it reads catalytic converter Bank 1. On my car there are 4 catalytic converter but have no idea witch one is the bank 1I think I have the same code but it reads catalytic converter Bank 1. On my car there are 4 catalytic converter but have no idea witch one is the bank 1
Have the sames codes on my 99 4.6. cleared the codes ,went to fill up with 91 oct. thought maybe last fillup accidently put in 87 oct. Still waiting to see if codes pop up again
Have the sames codes on my 99 4.6. cleared the codes ,went to fill up with 91 oct. thought maybe last fillup accidently put in 87 oct. Still waiting to see if codes pop up again
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Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
In simple terms, it means the engine computer is not "seeing" the O2 sensor switch from rich to lean like it should be doing.
When the O2 sensor switches to lean the computer makes the injectors open more to let in more fuel, until the sensor switches to rich.
P2197 - Lack of HO2S-21 Switch, Sensor Indicates Lean
A Heated 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.
See the possible causes for DTC P2195.
It won't mess up the a/f ratio. The Check engine light will be on because of the rear O2 sensors. To keep the light off you will need to install O2 sensor simulators.
THEY (2-3) are an absolute PAIN to change...try running "SeaFoam" in the tank for 100 miles or so first. Avaialble at Advance Auto Parts $8. follow directions Good Luck
I think you will find the aftermarket Cat Conv. is the source of your problem, but without hooking up to the factory test equipment at my disposal at my Ford dealer this at best and educated guess based on 20 years of emission related work, I am a Ford certified master electronics technician
Bank 1 is the side that has # 1 cylinder in it, the sensor is located in the exhaust head pipe before the Cat Converter, one note of caution: an O2 code does not always indicate an O2 sensor problem, it depends if the code is a lean code or a rich code, lean may may be a sensor, rich is never a sensor, lean codes can be caused by all kinds of issues, a bad MAF, a vacuum leak from hoses or a leaking intake gasket, an injector problem and so on. Good luck hope it is the sensor.
I think I have the same code but it reads catalytic converter Bank 1. On my car there are 4 catalytic converter but have no idea witch one is the bank 1
Have the sames codes on my 99 4.6. cleared the codes ,went to fill up with 91 oct. thought maybe last fillup accidently put in 87 oct. Still waiting to see if codes pop up again
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