Obd ii p0420, p0430

JeffyJingles · 04-28-2012, 12:10 AM

I have a 2004 Ford Ranger V6 4.0L 5-Speed 4wd with 180k and i recently had trouble codes:
P0420 is Catalyst system efficiency below threshold, ( bank 1 )
P0430 " ", (bank 2)

The truck is running fine and doesn't idle rough or stall. I checked the fuel pressure and im getting 70 psi constant. Im not sure if gutting the catalytic would fix the problem so does anyone know the remedy to my codes?

**Sasquatch_Ryda** · 04-28-2012, 12:59 AM

Gutting the cats will cause the same codes.....plus it's illegal.

This needs some diagnosing, could be failed cats or could be failed sensors....not too often both sensors die at the same time though. You would need a shop or someone with a scan tool that can monitor PIDS to watch the upstream and down stream sensors and see if they are mirroring each other. If so, you need new cats.

Fuel pressure should be 60-65 psi key on engine off or running.

JeffyJingles · 04-30-2012, 11:55 AM

I monitored the upstream o2 sensors with a voltmeter and they seem to fluctuate steadily from high to low but never above 1 volt. the downstream after the cat o2 was reading .800. so im led to believe its the cat. i ordered a new one and its on its way. hopefully that will fix these fault code.

04-28-2012, 12:10 AM	#1
JeffyJingles New Member Join Date: Jan 2011 Location: Tucson, AZ Year: 2004 Make: Ford Model: Ranger XLT Engine: 4.0L SOHC Class: 4x4 race Used For: Daily Driving Posts: 5 Rep Power: 0 iTrader: (0)	Obd ii p0420, p0430 I have a 2004 Ford Ranger V6 4.0L 5-Speed 4wd with 180k and i recently had trouble codes: P0420 is Catalyst system efficiency below threshold, ( bank 1 ) P0430 " ", (bank 2) The truck is running fine and doesn't idle rough or stall. I checked the fuel pressure and im getting 70 psi constant. Im not sure if gutting the catalytic would fix the problem so does anyone know the remedy to my codes?
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04-28-2012, 12:59 AM	#2
Sasquatch_Ryda Coast Mountain Crawlers Join Date: Aug 2007 Location: Terrace, BC, Canada Year: 1991/1997/2008 Make: Ford Model: Ranger/Ranger/SuperDuty Engine: 4.0L/3.0L/6.4L Class: 4x4 Used For: Play toy/Daily Driver/Grocery Getter Posts: 7,470 Rep Power: 10 iTrader: (0)	Gutting the cats will cause the same codes.....plus it's illegal. This needs some diagnosing, could be failed cats or could be failed sensors....not too often both sensors die at the same time though. You would need a shop or someone with a scan tool that can monitor PIDS to watch the upstream and down stream sensors and see if they are mirroring each other. If so, you need new cats. Fuel pressure should be 60-65 psi key on engine off or running. __________________ http://www.coastmountaincrawlers.com 1991 Ranger - one tons, 3 link, air shocks and 40's 1997 Ranger - reg cab flare side, 3.0L, M5OD-R1, 4x4, 4.56 gears, 6" lift, 33" MT's. 2008 F350 - 6.4L Powerstoke Diesel, 35x12.50R18 Procomp Xtreem AT's on 18x9 Incubus Crushers, AFE DPF/DOC Delete pipe, H&S XRT Pro tuner, AFE Stage 2 intake 1967 Mustang Coupe - 289, c4, pretty much stock Last edited by Sasquatch_Ryda; 04-28-2012 at 01:02 AM.
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04-30-2012, 11:55 AM	#3
JeffyJingles New Member Join Date: Jan 2011 Location: Tucson, AZ Year: 2004 Make: Ford Model: Ranger XLT Engine: 4.0L SOHC Class: 4x4 race Used For: Daily Driving Posts: 5 Rep Power: 0 iTrader: (0)	I monitored the upstream o2 sensors with a voltmeter and they seem to fluctuate steadily from high to low but never above 1 volt. the downstream after the cat o2 was reading .800. so im led to believe its the cat. i ordered a new one and its on its way. hopefully that will fix these fault code.
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