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Author Topic: Code 21  (Read 371 times)

Jason Goldsack

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Code 21
« on: March 14, 2011, 03:21:21 PM »

Code 21 came up on the Sebring today.. that is the o2 sensor failure code.

I'm sure my 2.5 V6 has two o2 sensors.. do I have to change both of them.. how do you know which one failed?




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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Jason Goldsack

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Code 21
« Reply #1 on: March 14, 2011, 03:22:52 PM »

oops.. I found that 21 is left upstream 0 2 sensor failure.. I guess I just answered my own question..

What does the computer do when one fails.. go into limp mode or just reads off the other one?


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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Steve

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Code 21
« Reply #2 on: March 14, 2011, 04:18:44 PM »

it has 4 o2 sensors  2 before and 2 after the Cat.  without a scanner, can't help you with which one. 

If one fails it falls on the second one and compares to the apposing side to keep balance in the engine.
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Jason Goldsack

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Code 21
« Reply #3 on: March 14, 2011, 04:47:43 PM »

4?!!!!!!!! WTF........!!!

I thought you only have 4 in dual exhaust


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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Steve

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Code 21
« Reply #4 on: March 14, 2011, 05:11:09 PM »

Sorry, , , that's if you had duals
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Steve

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Code 21
« Reply #5 on: March 14, 2011, 05:12:27 PM »

You probably have 3 then. . . .  But it works like that  It will reference the right one to keep the engine balanced and in tune 
 
Trying to do too much
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Jason Goldsack

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Code 21
« Reply #6 on: March 27, 2011, 05:06:31 AM »

Well driving down the road yesterday the light went out.. and the car used half the fuel on the way home...wtf?

I did get gas at somewhere other than my normal gas station.. do you think a bad tank of fuel  tripped the 02 sensor light then the new fuel gave the ECU a reading it liked then shut it back off?


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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Steve

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Code 21
« Reply #7 on: March 27, 2011, 02:24:24 PM »

MMMMMM
 
Not sure about that one. . . Maybe the O2 was coated with soot and it blew off
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Jason Goldsack

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Code 21
« Reply #8 on: March 27, 2011, 02:39:36 PM »

Sure runs better....

I also checked to make sure it wasn't just a bulb issue.. it comes on when the key is turned on.


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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Corey

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Code 21
« Reply #9 on: March 28, 2011, 07:38:02 AM »



the computer runs all sorts of test for the emission system and it can shut the light off if a previous failed test passes i would if nothing else take it to one of you local auto parts house the does the scanning and have them pull the history any o2 codes would be stored there as well as any other codes. also from the sounds of it you filled up at a station that you dont normally use and ran that tank out then filled up again if that is the case alot of these newer cars will set the light if the gas cap is not fully tight ive seen many of those if you have the type of cap that clicks make sure you always get at least 3 clicks out of it when you put it back on
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Jason Goldsack

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Code 21
« Reply #10 on: March 28, 2011, 08:28:06 AM »

good point.. but I went through a few tanks before I switched gas stations... then it out after using about an 1/8 th of the new fuel...

I'm starting to think it is bad fuel..

I will get the history pulled up and might change the 02 when the weather gets warm and I can get underneath the car on the lawn


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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Snotty

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Code 21
« Reply #11 on: March 28, 2011, 09:20:47 AM »

Quote from: stinger1170
alot of these newer cars will set the light if the gas cap is not fully tight
 

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Jason Goldsack

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Code 21
« Reply #12 on: March 28, 2011, 03:00:19 PM »

I'm just happy it's back to it's 32 MPG driving again.. 

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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

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