2012 6.2 Inefficient Catalyst
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Mountain Pass
Joined: May 2019
Posts: 220
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2012 6.2 Inefficient Catalyst
I had discussed this here a while back and cannot locate the previous thread to update. Truck had thrown Po420 and Po430, cleared the codes. A few hundred miles later Po420 came back and Po430 is pending. I checked the rear o2 voltage coolant was 180* they were switching between .7 and .8 volts. Upstream o2 sensor short term fuel trim is fluctuating between -4% and -6% no lean codes truck seems to run good.
It is possible the converters are ruined I bought this non running. It had a broken exhaust valve spring on cyl 6, and a bad MAF sensor. After driving it about 400 miles PO128 came up. All of these issues have been resolved. What I don’t know is how long it was drove in this condition before being sold. When I first ran it in the dark before fixing anything after a 5 mile run both converters were glowing orange.
Make the call on the converters?
It is possible the converters are ruined I bought this non running. It had a broken exhaust valve spring on cyl 6, and a bad MAF sensor. After driving it about 400 miles PO128 came up. All of these issues have been resolved. What I don’t know is how long it was drove in this condition before being sold. When I first ran it in the dark before fixing anything after a 5 mile run both converters were glowing orange.
Make the call on the converters?
or it is plugged.
More Turbo
Joined: Sep 2013
Posts: 596
Likes: 23
From: Watson
I mean, from here, yeah, that's an easy call to make. Combination of bad MAF and exhaust spring certainly could've wrecked the convertors. Considering how none of the other vehicles you see on the roads feature that "catalytic underglow kit", pretty easy to say the cats are shot.
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