I cleared CEL P0420!!!!!! (1 Viewer)

[OJ95]

I just acquired a 1996 Lexus LX450 w/ 182k & 1 week into my possession, I got the dreaded code P0420. This is the sequence I took to clear it (its been 1 week & no CEL):
1. Changed PCV & hose (due to carbon build up) with OEM parts
2. Checked exhaust system for leaks (no leaks found)
3. Filled tank with Shell super unleaded
4. Added 1 can of BG 44k fuel cleaner






5. Changed cap & rotor with OEM parts
6. Unplugged negative cable on battery
7. Unplugged EFI fuse in near battery
8. Plugged EFI fuse & negative cable back on
9. Ran truck & code came back on (I am thinking the ecm hadn't picked up the cleaner fuel & BG 44k hadn't started cleaning!
10. Repeated steps 7, 8 and 9
That's what I did & it hasn't came back on! The engine is running really smooth on idle & acceleration!
I know there's a ton of threads on this but this might be cheapest step at clearing this code. Plus it will give your engine a good cleaning! I've always believed in using good fuel!
Thanks & good luck!
OJ95

 

[OJ95]

Sorry, step 10 should read:
10. Repeat step 6, 7 & 8

 

[Stevesnj]

Where did you get the 44k?

 

[86tuning]

Where did you get the 44k?

You can get it at any shop that is supplied by BG. Many repair shops use BG just call around town

 

[OJ95]

I got it at a Napa store!

 

[Stevesnj]

I got it at a Napa store!

Thanks

 

[1ststatecruiser]

IPOR carries them

http://www.ironpigoffroad.com//index.php?main_page=index&cPath=99

 

[OJ95]

I paid $24.99 for the single can of 44k, I did not use the 3 can system. But I would imagine that the 3 can system is the way to go!
-OJ

 

[OJ95]

Here is a news story on this product:
https://www.youtube.com/watch?v=FlmUkS8PfUI&feature=youtube_gdata_player

 

[427060]

It looks like the only thing of significance in that BG 44K stuff is Naphtha, at least according to the MSDS. Marvel Oil and Seafoam use it as the primary ingredient as well, and they're a bit cheaper.

I've read that Polyether Amine is better at cleaning varnish. It's in things like Gumout Regane and Techron fuel additive.

 

[Mrtwooooo]

I get a P0420 code quite often. It only happens when I'm cruising at about 40 mph. On my way to work at my previous job it only came on when I was on a certain stretch of road. The road had nothing to do with throwing the code. I think just the speed I was going and how I drove the road triggered something. I have driven on the in interstate for hours and have never gotten the code. I have changed my front O2 sensor but haven't changed the rear because I haven't been able to get the rusted bolts off.

 

[blunderbuss]

I get a P0420 code quite often. It only happens when I'm cruising at about 40 mph. On my way to work at my previous job it only came on when I was on a certain stretch of road. The road had nothing to do with throwing the code. I think just the speed I was going and how I drove the road triggered something. I have driven on the in interstate for hours and have never gotten the code. I have changed my front O2 sensor but haven't changed the rear because I haven't been able to get the rusted bolts off.

on those o2 nuts. try applying heat with a small torch ($20 @ most auto parts stores) and some PB Blaster to the nut, repeat 2-3 times while trying to tighten slightly before loosening working the nut back and forth. It will eventually loosen up for you.

 

[bdac]

I get a P0420 code quite often. It only happens when I'm cruising at about 40 mph. On my way to work at my previous job it only came on when I was on a certain stretch of road. The road had nothing to do with throwing the code. I think just the speed I was going and how I drove the road triggered something. I have driven on the in interstate for hours and have never gotten the code. I have changed my front O2 sensor but haven't changed the rear because I haven't been able to get the rusted bolts off.

Same with me. Drive 40mph on a stretch of road for about 4 miles and bingo - CEL. Other than that, it doesn't normally turn on. All I ever do is reset the light and call it a day. My 95' has passed emissions with the CEL because it's through the tailpipe and according to the sniffer, all is okay. The previous owner changed both O2's with universal, but I haven't had the need to swap them with OEM.