2003 Ford Ranger CATALYTIC CONVERTS

Tiny
WMMARTOS
  • MEMBER
  • 2003 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 88,500 MILES
My truck is showing fault codes PO172 & PO175 the trucks runs ok but can't pass the emmisions test. A muffler shop told me I have 5 convertors on this truck & the cost will be $2000, 00 to replace them. Can this be true?
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Thursday, February 5th, 2009 AT 4:35 PM

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Tiny
DAVE H
  • EXPERT
Hello. Thanks for the donation. Much appreciated !

The DTC codes you have are telling you the vehicle is running rich on fuel. Nothing to do with the catalytic conlvertor !. Below is some of the probable causes. But I would be removing and cleaning the MAF sensor first ! Hope this helps. Let me know

41) For Continuous Memory Only DTC P0171, P0172, P0174 Or P0175: Fuel System At Corrected Fuel Trim
All Continuous Memory ignition and misfire DTCs must be serviced prior to servicing any fuel trim DTCs. DTCs P0171, P0172, P0174 and P0175 indicate a concern when adaptive fuel strategy senses a lean or rich condition beyond minimum or maximum calibrated limit. Fuel system DTC identification is as follows:
Bank No. 1

DTCs P0171 (lean), and P0172 (rich).
Bank No. 2

DTCs P0174 (lean), and P0175 (rich).
Possible causes for these faults are:
Fuel System

Excessive fuel pressure, leaking or contaminated fuel injectors, leaking fuel pressure regulator, low fuel pressure or engine running out of fuel or vapory recovery system fault.
Induction System

Air leaks after MAF sensor, air intake system obstructions, vacuum leaks, PCV system or improperly seated engine oil dipstick.
EGR System

Leaking gasket, stuck EGR valve or leaking diaphragm or EVR.
Engine Mechanical

Engine oil overfilled, cam timing, cylinder compression or exhaust leaks before or near HO2S.
Inspect engine for obvious defects in specified systems. Repair as necessary.
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Thursday, February 5th, 2009 AT 8:09 PM

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