2012 Post DIY Valley Cooling Plate Repair CEL P0420 (1 Viewer)

[Tommy Argh]

How goes the battle?

Well I still own it and haven’t given up just yet. I did find a small leak at the exhaust manifold flange just before the o2. Got that fixed as well as the opposite end of that pipe. Drove it for the weekend and the P0420 came back. Tested both sensors again and watched a bunch of data on the scanner. Showed a few different “mechanics” my results and I’m getting mixed answers. Decided to break out the smoker. Tested thru the exhaust pipe, thru the egr, and thru the intake. I did see a little wisp of smoke coming from the little hole on the side of the EGR valve. It was hard to photograph but you can a little bit of smoke in that hole if you zoom in. I’m guessing that’s unaccounted air coming in but no EGR valve code. Probably throw more parts at it and replace that. Im running out of options the next stop will be getting bent over at the dealership

 

[Acrad]

Were you thinking of replacing the EGR valve?

DIY Coolant Valley Leak Repair

Looks like I may have found the culprit of my strange low coolant condition. Though I haven’t crawled under it yet. What is odd is my tech didn’t find it when he did the multipoint inspection if it does exist. Would there be any puddles on the ground with this leak? I ask because I don’t...

forum.ih8mud.com

I know not a cheap part to throw at it

25620-38240​

 

[Tommy Argh]

Were you thinking of replacing the EGR valve?

DIY Coolant Valley Leak Repair

Looks like I may have found the culprit of my strange low coolant condition. Though I haven’t crawled under it yet. What is odd is my tech didn’t find it when he did the multipoint inspection if it does exist. Would there be any puddles on the ground with this leak? I ask because I don’t...

forum.ih8mud.com

I know not a cheap part to throw at it

25620-38240​

I am thinking of replacing it. It is one of the components I removed to fix the VCPL, it is a cause on the list for the code, and seeing a little bit of smoke from the tester come out sort of adds up. I did remove it and used roughly 3 cans of carb cleaner. I couldn’t break the two screws loose on the plastic cap to test the valve without stripping or braking the plastic so I threw it back together hoping that cleaning would help. What’s your suggestion?

 

[Acrad]

While I try to avoid the parts cannon... it has shown to be an obscure failure point over the years for some issues.

 

[Tommy Argh]

While I try to avoid the parts cannon... it has shown to be an obscure failure point over the years for some issues.

I want to test the Bank 1 sensor 2 harness to the ECU. Do you have a diagram similar to what you posted earlier for Bank 1 sensor 1?

 

[Acrad]

Are you just looking for a location as shown in Post #12 of engine bay?

 

[Tommy Argh]

Are you just looking for a location as shown in Post #12 of engine bay?

Yes sir. Location and maybe which terminals if they list it.

 

[Acrad]

C22

 

[Tommy Argh]

C22

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Thank you very much. I’m not very good at explaining things. I should have asked from the ECU side. I removed the passenger side of the dash and was overwhelmed by all of the little control modules. I’m assuming the o2s run off the main ECU/ECM but I’m not sure which plug or their colors. Sorry for the confusion.

 

[Acrad]

This is how it is listed in FSM for "Air Fuel Ratio Sensor" on ECU side

 

[Tommy Argh]

This is how it is listed in FSM for "Air Fuel Ratio Sensor" on ECU side

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Thank you so much. I’m very grateful of you going out of your way. I’m hoping this will bring some light at the end of this tunnel.