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Codes - P0420 and P0430 - trying Cataclean first

Mike D S

Member
Joined
April 20, 2022
Messages
24
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6
City, State
Katy, TX
Year, Model & Trim Level
2013 Explorer Limited
Bought the bullet and ordered the USB adapter to try out Forscan. The program is pretty nice and clearly has way more features than I'm going to need anytime soon. But on the other hand it destroyed my dream of my catalytst monitor codes being bad O2 sensors.

The bank 2 cat is way out of range, so I'm going to order one from RockAuto and change it. The bank 1 cat is just a bit outside the allowable range (<10%) so I'm going to run a few treatments of Cataclean and see what we get. Access to the bank 1 cat looks like its really tough to get to without getting the truck on a lift so I'm hopeful the cataclean makes a difference and can get me just under the limit. The inspection sticker is due, so if I can replace the front and get enough improvement in the back to get the inspection done I'll be satisfied for the moment as that'll give me time.

13 Limited 3.5L has 156k miles and still runs fine and getting about 19 mpg (according to the dashboard) so their not clogged, but the downstream O2 sensors are clearly mirroring the upstream sensors. I'm waiting for this tank of gas to get a little lower and then I'll run the cataclean treatments and report back. I took screenshots of the monitor O2 capacity readings, so I'll be able to compare the numbers after running the cataclean and retesting.
 



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RonParise

Elite Explorer
Joined
December 5, 2019
Messages
80
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36
City, State
Ft Myers Fl
Year, Model & Trim Level
2011 Explorer limited
My 2011 limited was running a little bit rough and it threw a code indicating a miss fire. So new plugs and coils (it was time) A short time later as I was accelerating on to the interstate I got rapid fire backfires and it happened several times that day turned out to be a catalytic converter

There is no emissions test in Florida and my car is at 375000 miles, so I was reluctant to spend the money So I tried Cataclean.. It worked
 






Mike D S

Member
Joined
April 20, 2022
Messages
24
Reaction score
6
City, State
Katy, TX
Year, Model & Trim Level
2013 Explorer Limited
So I've got positive things to say about the Cataclean treatments.

Before first treatment:
1656618364251.png


After first treatment:
1656618389368.png


I did a second treatment and and measured again but forgot to take a screenshot since the bank 2 cat had arrived and I was going to swap it. But the bank 1 cat had come down to about 0.61 and I think it would not have been throwing the cat efficiency code. While I know I'll have to replace the other cat probably, I'm just trying to get it inspected in the short term so I can get the registration renewed as its out by a month.

So here's where it gets dumb. I had the front (bank 2) cat in hand and decide to swap the front cat out. In order to physically get the front cat out I need to drop the exhaust Y to have the necessary clearance. So I put some penetrating oil on the all the exhaust pipe bolts and let that sit then give them a few taps to loosen them up a bit. There's a little rust on the bolts but not that bad so I don't think that much about it. I get the front cat loose from the exhaust pipe without too much trouble and get the first nut loose on the rear cat with a little work but otherwise ok. Then I go to remove the second nut and it comes loose 2-3 turns and then basically locks in place. Won't go up, won't go down. mess around with it for a bit with a torch, penetrating oil, etc. Still stuck at first and then it feels like its starting to come loose about an 1/8 turn when the bolt just snaps off at the back of the nut.

So what starts as a 1 cat job is now a two cat job and I'm waiting on rock auto to deliver the second cat tomorrow to get up and running. So with any luck and assuming I don't do more stupid stuff I'll be ready to rock and roll by Saturday afternoon.
 






ProjectSHO89

Well-Known Member
Joined
June 9, 2017
Messages
134
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24
City, State
Robertsville MO
Year, Model & Trim Level
2015 Explorer XLT
I usually just install anti-foulers on the Downstream O2 sensor to cheat the OBDII system. Make sure you don't overlook any engine problems that may have fouled the cats...

Your fun with that stud is about as bad as mine from earlier this week. Had the 2010 Escape 3.0L up on jackstands to replace a leaking oil pan gasket. Went to drop the Y-pipe and one of the nuts that hold the y-pipe flange to the bottom of the front pre-cat decided to loosen about 6-8 turns then spun the threads on the stud. Cussed a few times, finally broke out the reciprocating saw and cut off the stud and finished the pan drop. Ended up having to drill the stud out of the bottom flange of the precat. $60 worth of cobalt drill bits with cutting oil and two hours later I managed to get the stud out so I could use a stainless bolt and nut to put the whole thing back together. At least the freaking new gasket isn't leaking...

Anyway, good luck...
 






Mike D S

Member
Joined
April 20, 2022
Messages
24
Reaction score
6
City, State
Katy, TX
Year, Model & Trim Level
2013 Explorer Limited
Decided last night to do a little get ready work so when the new cat shows up I'm ready to go. I'm doing the work at my house and just have the front of the Ex up on ramps. The bank 1 rear cat removal is no joke if you're doing it at home. On a lift in a real shop its probably not too bad, but for a DIY job its a make it work moment. It doesn't help that I have big hands and forearms so reaching up between the cat and the framing was not going to work.

I ended up using a combination of long extensions and doing most of the work through the driveshaft tunnel including removing the old cat. It didn't take all that long, but I can already see it's going to be a bit of a knuckle buster getting them back on and torqued up. This is a job where a set of impact flex adapters would probably help. A few of the top bolts on the rear cat needed the socket to be at an upwards angle and since I was coming at it from the bottom with extensions I had to use a shorter 1/2 impact socket with a knuckle to get the right angle to the nut/bolt and still clear the header.

But all in all I'm ready to go back in with the new cat when it shows up later today. Overall I'd rate the rear cat as a 3-4 hour DIY job.
 






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