Question about 2003 Ford Ranger Regular Cab
PO422 - is A failed Exhaust Converter (Bank 1)
Your truck shouldn't have that problem after 8 years,
unless you have had ignition misfires for years or a
rich condition, either of which set no MIL Lamp or
you didn't experience any drivability issues.
I would start by checking fuel pressure
Then if the O2 sensors are over 100,000 miles,
replace the ones closest to the engine
You really should put an oscilloscope on them,
before replacing, to see how well they switch
The rear O2 Sensors are what is setting the MIL
Lamp. If they move around voltage wise on a scope,
your converter is shot,but why?
Your spark plugs shouldn't be in there over 60 to70,000 miles
Clean MAF Sensor once a year with CRC MAF Cleaner
Check for vacuum leaks-best way is an EVAP Smoke Machine
Do the entire vehicle,EVAP System as well
Also engine Temp is important & all related thermostat,sensors
etc working correctly
Posted on May 23, 2011
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak
Sometimes simply resetting the code is all you need to do. Many codes will reset themselves over time. What the person meant was that in normal driving the code may reset itself. You don't need to waste your time or fuel driving nowhere to attempt to reset the code.
Personally, here is what I would do if I were you. If the place in Texas where you are moving to does not require emissions testing, do nothing for now. If the car seems to be running normally the code may reset itself. If Texas requires emissions testing you will need to have the problem addressed or the car will not pass emissions. Bring the car to a reputable independent mechanic for repairs. If it is your catylitic converter expect some sticker shock as these can be expensive. Hope this helps, Please rate this!!! :) James Booth
Posted on May 23, 2011
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Posted on Jan 02, 2017
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