Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300 > Performance & Maintenance
Sign in using an external account
Register Forgot Password?

Sc400 code 21 and 28

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 04-26-13, 09:09 PM   #1
Tam4511
Driver
Trader Score: (9)
 
Tam4511's Avatar
 
Join Date: Sep 2012
Location: Texas
Posts: 139
Tam4511 TAM101 tyler_august
Default Sc400 code 21 and 28

ok so after a long process of deleting my egr and fixing exhaust leaks, i finally have sealed the exhaust up. but now i have 2 codes, 21 and 28, which are for both main o2 sensors. I've had these codes before and it would alternate between them and lean afr when my exhaust was leaking.

Do you guys think my 02 sensors are actually bad? which would kinda make sense since its been running rich for a while (2-3 months)

or is there some other possible cause? it never had a code before i started messing with the egr system and exhaust .

It just doesn't make sense to me for them to both go out at the same time.

EDIT: its a soft code btw. it will be off when i go to start my car, and come back on after 10-15 minutes of driving.

and i am currently catless, straight pipe to the oem secondary mufflers. i had gotten 90 degree o2 defoulers but they wont fit on the sub 02 sensor bungs because they are angled. im not sure if this would be a cause as well, but if it was id think it would jsut throw a lean code right?

I did search a lot for people having both codes and didnt find anything, if there is a thread explaning this problem, I apologize. please direct me to it.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!

Last edited by Tam4511; 04-27-13 at 07:22 AM..
Tam4511 is offline   Reply With Quote
Old 04-04-14, 11:09 PM   #2
Stretchp2
Rookie
Trader Score: (0)
 
Stretchp2's Avatar
 
Join Date: Aug 2008
Location: Florida (JAX)
Posts: 54
Sk8teboredp
Send a message via AIM to Stretchp2
Default

Unfortunately I have no reply but I am throwing the same 2 codes. (Soft) just like you. Have u solved the problem yet?
__________________
04 LS 430
slvr blk guts.
Stretchp2 is offline   Reply With Quote
Old 04-05-14, 11:42 AM   #3
grumpi300
Pole Position
Trader Score: (0)
 
Join Date: Jun 2012
Location: Las Vegas, NV
Posts: 230
Default

No I haven't fixed it yet. But I did get the diagnostic chart that tells me step by step what to do. I'll post it on here. But as for me, I believe it's the ecu for sure. I'm gonna buy one with my first paycheck. Then if I get the same codes I'll figure it's something due to wiring. But being I need a new ecu either way, might as well get it first the check everything else after.
grumpi300 is offline   Reply With Quote
Old 04-05-14, 11:44 AM   #4
grumpi300
Pole Position
Trader Score: (0)
 
Join Date: Jun 2012
Location: Las Vegas, NV
Posts: 230
Default

Thanks for the input tam451. much appreciated. I'll keep that in mind if the codes do come back after I change the ecu.
grumpi300 is offline   Reply With Quote
Old 04-05-14, 08:22 PM   #5
fourstars
Rookie
Trader Score: (0)
 
Join Date: Oct 2013
Location: Cali
Posts: 66
Default

you say soft, buts its actually normal. o2 works when motor is hot... check the grounds and power wires on those 2 sensors.
fourstars is offline   Reply With Quote
Old 04-05-14, 10:14 PM   #6
grumpi300
Pole Position
Trader Score: (0)
 
Join Date: Jun 2012
Location: Las Vegas, NV
Posts: 230
Default

Wow. I just realized this is not my thread. Lol. I posted a code 14 and 22 and for some reason I thought stretchp2 was talking to me. I feel retarded.
grumpi300 is offline   Reply With Quote
Old 04-05-14, 10:14 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine Code 25 - O2 sensors? capacitors? EGR pipe? oldskewel LS400 0 09-15-14 12:30 PM
FINALLY SOLVED! P071 and P074 Codes!!!! HtownBlue RX - Second Generation 15 09-26-13 08:05 PM
FINALLY SOLVED!!!! P0171 and P0174 Codes. Check Engine/VSC/TRAC lights... HtownBlue RX - Second Generation 1 01-05-13 09:42 AM
code 25? Tam4511 Performance & Maintenance 5 12-19-12 03:47 PM
exhaust noob 12340987 ES300 and ES330 7 05-19-09 12:04 AM


Tags
13, 1992, 21, 28, 92, club, code, codes, lexus, sc400

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 10:39 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info