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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 01-02-2013, 05:37 PM
Tdarrington Tdarrington is offline
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Mein Auto: 325XI
Service engine soon light

I have a service engine light on in my 2003 325XI and I ran the codes and it was showing that I had an air leak, i.e. needed a new gas cap. The light still has not gone of so I am looking for any ideas if there is a sensor that may need to be replaced.
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  #2  
Old 01-02-2013, 05:39 PM
QAfred QAfred is offline
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It'll go off after several cycles showing no pressure issues. It needs three complete warm up cycles to go off. Give it a day or two.
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  #3  
Old 01-02-2013, 05:41 PM
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Fast Bob Fast Bob is offline
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It usually takes 3 or 4 cycles of driving at least 15 miles for the codes to go away.
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  #4  
Old 01-02-2013, 05:42 PM
Tdarrington Tdarrington is offline
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Thanks, it has been over a week so that is why I am thinking something else.
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  #5  
Old 01-02-2013, 06:02 PM
QAfred QAfred is offline
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what exactly are the codes?
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  #6  
Old 01-02-2013, 07:16 PM
vandyboy vandyboy is offline
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If the car is pulling the same code as before, clear all codes and see if it returns.
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  #7  
Old 01-02-2013, 07:21 PM
Tdarrington Tdarrington is offline
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I will have to go run them again as I had the auto parts store run it. I will go and have them do it again and post. It is my understanding they cannot clear the codes so is there a way to do it.
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  #8  
Old 01-02-2013, 07:29 PM
vandyboy vandyboy is offline
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Quote:
Originally Posted by Tdarrington View Post
I will have to go run them again as I had the auto parts store run it. I will go and have them do it again and post. It is my understanding they cannot clear the codes so is there a way to do it.
Most of the parts stores now have a policy that they will not clear codes, only read them. If you are nice to the guy and explain your situation, he might set the OBD II reader to clear and have you push a button. That is what the guys around here do.
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Old 01-04-2013, 09:04 AM
Tdarrington Tdarrington is offline
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It is pulling a PO455 code. I noticed the light went on after I cleaned the motor and undercarriage so I wonder if I hose or a wire came loose.
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  #10  
Old 01-04-2013, 09:24 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by Tdarrington View Post
It is pulling a PO455 code. I noticed the light went on after I cleaned the motor and undercarriage so I wonder if I hose or a wire came loose.
I studied what clears the P0455 code here:
- What clears the P0455 gas cap large/small leak diagnostic trouble code (1)

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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 01-04-2013, 09:26 AM
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bluebee bluebee is offline
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Originally Posted by Tdarrington View Post
It is my understanding they cannot clear the codes so is there a way to do it.
Sure, $20 bucks and you can clear all the codes 'till the end of time.
- Cheapest CAN OBDII scanner on the net that reads DTCs, pending codes, & clears codes

I buy these in bulk for Christmas gifts for my family:
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #12  
Old 01-04-2013, 11:31 AM
Rudyj07 Rudyj07 is offline
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I had a similar situation, replaced cap and it came down to replacing the purge valve. Replaced the valve and have had no issues.
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  #13  
Old 01-04-2013, 11:40 AM
joegr joegr is offline
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Quote:
Originally Posted by Tdarrington View Post
It is pulling a PO455 code. I noticed the light went on after I cleaned the motor and undercarriage so I wonder if I hose or a wire came loose.
You do know that that code does not say "replace gas cap." It says there is a leak in the fuel tank vent system. It could be the gas cap, but it could be something else instead.
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