LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

CEL Code 21

Reply Subscribe

Search this Thread

Old

Sep 24, 2006 | 10:29 PM

#1

squeekyM

Thread Starter

Driver School Candidate

Joined: Jan 2005

Posts: 8

Likes: 0

From: CA

Default

CEL Code 21

Hi,

I just had my Check Engine Light turn on this afternoon. I have a '91 LS400 w/ just about 230K. I ran the CEL test, and it read code 21. What does this mean. I did a search and found something that mentioned the "solar sensor". What exactly is the issue and how would I fix this. Thanks in advance for the help.

Reply

Old

Sep 24, 2006 | 10:45 PM

#2

dfkd

Intermediate

Joined: Nov 2005

Posts: 389

Likes: 24

From: ON, Canada

Default

Actually that code is for an O2 sensor.

You'll need to be replacing at least one of them.

Reply

Old

Sep 24, 2006 | 11:53 PM

#3

squeekyM

Thread Starter

Driver School Candidate

Joined: Jan 2005

Posts: 8

Likes: 0

From: CA

Default

Thanks for the response. How do I verify which o2 sensor it is... bank 1 or 2, upstream/downstream?

Reply

Old

Sep 25, 2006 | 08:47 PM

#4

squeekyM

Thread Starter

Driver School Candidate

Joined: Jan 2005

Posts: 8

Likes: 0

From: CA

Default

anyone have any ideas?

Reply

Old

Sep 25, 2006 | 09:44 PM

#5

dfkd

Intermediate

Joined: Nov 2005

Posts: 389

Likes: 24

From: ON, Canada

Default

I think that specific diagnosis might require a code reader.

Reply

Old

Sep 26, 2006 | 07:36 AM

#6

Tammy

Lexus Champion

Joined: Mar 2004

Posts: 1,973

Likes: 10

From: Arizona

Default

With your mileage, and if they are original, I would suspect both upstream.

Reply

Reply Subscribe

Related Topics

Thread

Thread Starter

Forum

Replies

Last Post

Code P0137 Deji Vu

Fritz330

ES - 1st to 6th Gen (1990-2018)

1

Jul 3, 2016 07:45 PM

FYI: Code P0171

RayN

RX - 1st Gen (1999-2003)

2

Jan 17, 2015 09:23 AM

....and here we go(P0031 code)

Slvr surfr

LS - 3rd Gen (2001-2006)

6

Nov 9, 2013 06:08 AM

BostonSC4

SC - 1st Gen (1992-2000)

1

Jun 30, 2010 04:21 PM

Reply Share

First
Prev
1 / 1
Next
Last

All times are GMT -7. The time now is 10:42 PM.