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#1
08-20-2007, 04:50 PM
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03 Dodge Ram 1500
I have an 03 Dodge Ram 1500 that keeps thowing P421 engine codes. This will come on and then go out. The last time it stayed on for 3 weeks and now it is out again. Any thoughts? I have about 76000 miles on it.
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#2
08-21-2007, 08:37 AM
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Re: 03 Dodge Ram 1500
My code book says "Warm up catalyst efficiency bank 1 below threshold". I think it means your O2 sensors are not warming up fast enough. May have to replace O2 sensors. You should have them checked with a scan tool that can read live data.
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#4
08-22-2007, 05:34 AM
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Re: 03 Dodge Ram 1500
You have an oxygen sensor in front of the converter and one behind the converter. Your auto parts store sells a tool that makes it pretty easy to install. The hard part is getting it to break free of the rust. My rear one went out about 6 months ago. I think it was about $100. A little expensive if you are not sure that is your problem. They make cheaper ones that you have to splice the wires together but mine was a direct plug in.
__________________
HERS---> 2006 Grand Marquis GS (replaced my 1998 w/cracked manifold) HIS----> 2003 Dodge 1500 HEMI QC 4X4
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