Error Code P0420
#1
Driver School Candidate
Thread Starter
Join Date: Sep 2008
Location: Arizona
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Error Code P0420
I just had my exhaust installed a few days ago and havent had any issues until today. My Check engine light came on, So I went to Lexus and the ran a diagnostic on it and came back with a code error P0420 "Catalyst System Efficiency Below Threshold (Bank 1). They are telling me its because of the new exhaust.
I have search on the forum and havent found much help. Does anyone know how to fix this? The cats were removed is this causing the problem?
I have a 2006 IS350
Thanks for anyones help.
Mike
I have search on the forum and havent found much help. Does anyone know how to fix this? The cats were removed is this causing the problem?
I have a 2006 IS350
Thanks for anyones help.
Mike
#3
Yes. I drove the LFA.
iTrader: (9)
If the cats were removed, then yet, installing that exhaust caused the code. Did the main cats on the manifold get removed, or the rear cats in the mid pipe? If its the main cats, then yes, you caused the code, and you'd need to get O2 simulators to get rid of the light...
#4
Driver School Candidate
Thread Starter
Join Date: Sep 2008
Location: Arizona
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
The cats buy the manifold were not removed just the ones midway. So o2 simulators need to be put in. Are they difficult to do and how long do they last?
Thanks a bunch, Mike
Thanks a bunch, Mike
#6
I think a more likely answer would be a damaged/improperly installed 02 sensor. Removing the secondary cats will NOT throw codes for any reason, there are zero sensors monitoring them.
#7
The o2 Sensor for Bank 1 might be the issue. Bank 1 is the passenger side sensor for a US spec vehcile.
Trending Topics
#10
Tech Info Resource
iTrader: (2)
It's also slightly possible the shop forgot to reconnect the sensor when they did the work.
#11
Driver School Candidate
Thread Starter
Join Date: Sep 2008
Location: Arizona
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Hey Everyone thanks a bunch for all your help, This Forum has been the most informative of the 3 that I visit. Is there a way to test a o2 sensor to see if it is still good? (like you said about touching it and such).
GHL Motorsports did a prototype exhaust for my vehicle. As you see from the site they do alot with Audi, Corvettes, and other foreign vehicles.
The have been great as far as responding to my Issues, I am taking it to them to look at so we can get it worked out.
Thanks, Mike
GHL Motorsports did a prototype exhaust for my vehicle. As you see from the site they do alot with Audi, Corvettes, and other foreign vehicles.
The have been great as far as responding to my Issues, I am taking it to them to look at so we can get it worked out.
Thanks, Mike
#12
Tech Info Resource
iTrader: (2)
There's no easy way to test an O2 for function without a device to plug into the ECM and check directly. I'd go for the obvious first - check the install, check the air hole, and check the wiring. If there's nothing obvious, then you'll need the laptop with the Lexus software to troubleshoot it - or you can just replace it and see if the problem persists. I doubt it would.
Thread
Thread Starter
Forum
Replies
Last Post