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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 02-19-2011, 07:19 PM   #1
AlpinewhiteXi
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service engine light.

I'm sure there are tons of codes that set this light off, new to the e46 community and wondering what issues most commonly make it come on. i.e. plugs, air filter, etc? Or are we talking something a little more involved like an o2 sensor? Any feedback would be appreciated. Thanks.
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Old 02-19-2011, 07:56 PM   #2
Lusticles
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The possibilities are endless. No use in guessing.
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Old 02-19-2011, 08:20 PM   #3
AlpinewhiteXi
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So my best bet is to take it in to a shop to be diagnosed? Any DIY ways of finding out which code it is?
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Old 02-19-2011, 09:20 PM   #4
dgoddard
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Go to Autozone, they will give you a print out for free of the codes. Then take the codes and search for them on the forum.
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Old 02-21-2011, 10:28 AM   #5
AlpinewhiteXi
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Thanks, found the codes here on the site.
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Old 02-22-2011, 04:17 AM   #6
anhtu402
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What was your code? Just curious

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Old 02-23-2011, 07:37 PM   #7
kudang
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service engine light

My engine light came on and was diagnosed as cyclone valve fault and thermostat fault.
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Old 02-24-2011, 07:54 AM   #8
SILVRRONIN
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Cyclone vale??? thermostate fault I can understand..a cyclone valve?..never heard of it..
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Old 02-24-2011, 07:58 AM   #9
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If you're in the cold, and the SES pops up every month or so, usually it's the gas cap that throws this off. If it wasn't properly secured during a fill up, it'll put on the SES light. Unscrew the gas cap and screw it back in, then for the light to be reset, it usually takes 2 to 3 days of driving at various speeds. I've had this problem almost every winter.
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Old 02-24-2011, 08:34 AM   #10
Kubica
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Quote:
Originally Posted by AlpinewhiteXi View Post
I'm sure there are tons of codes that set this light off, new to the e46 community and wondering what issues most commonly make it come on. i.e. plugs, air filter, etc? Or are we talking something a little more involved like an o2 sensor? Any feedback would be appreciated. Thanks.
10 year-old BMW? Time to invest in a Peake tool . . .
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Old 02-24-2011, 08:36 AM   #11
99
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Originally Posted by SILVRRONIN View Post
Cyclone vale??? thermostate fault I can understand..a cyclone valve?..never heard of it..
I had to look it up too. It's the CCV.
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Old 02-24-2011, 09:08 AM   #12
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10 year-old BMW? Time to invest in a Peake tool . . .
I think its the best to do it if you have intention to keep the car for more then one year, I just bought one yesterday when for the first time the SES turns on.
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Old 02-24-2011, 04:21 PM   #13
AlpinewhiteXi
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Originally Posted by anhtu402 View Post
What was your code? Just curious

Sent from my PC36100 using Bimmer App
I came up with p0128. I reset the code and will see if it comes back on. From my research sounds like it is most commonly the thermostat that throws this code due to the engine not heating up fast enough. Could be from some of the brutal cold days we have had in the past couple months here in Denver. If it is the thermostat at least it's easy to replace
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Old 02-24-2011, 04:24 PM   #14
AlpinewhiteXi
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10 year-old BMW? Time to invest in a Peake tool . . .
Actron scanner, Thanks.
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Old 02-24-2011, 05:44 PM   #15
Kubica
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Originally Posted by AlpinewhiteXi View Post
I came up with p0128. I reset the code and will see if it comes back on. From my research sounds like it is most commonly the thermostat that throws this code due to the engine not heating up fast enough. Could be from some of the brutal cold days we have had in the past couple months here in Denver. If it is the thermostat at least it's easy to replace
That's thermostat stuck open code- replace thermostat soon.
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Old 02-24-2011, 06:04 PM   #16
AlpinewhiteXi
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That's thermostat stuck open code- replace thermostat soon.
Got it thanks!
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Old 02-25-2011, 03:01 PM   #17
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Originally Posted by Kubica View Post
10 year-old BMW? Time to invest in a Peake tool . . .
^+1

To help diagnosis codes in the future...

Can't go wrong with PEAKE!

Manufactured specifically for BMWs, Peake scan/reset tools make servicing your BMW cheaper and easier than ever.

The tool easily connects to your diagnostic port in the engine bay and allows you to read any codes for a check engine light as well reset your oil service and inspection light with the push of a button.

This tool is a must for the first time do-it-yourself mechanic and to complete any tool box.

Click HERE to order or for more information.


Please let us know if you have any questions! Feel free to shoot me a PM or email.

Best,
Joe
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Old 02-25-2011, 05:18 PM   #18
AlpinewhiteXi
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Originally Posted by ECSTuningJoe View Post
^+1

To help diagnosis codes in the future...

Can't go wrong with PEAKE!

Manufactured specifically for BMWs, Peake scan/reset tools make servicing your BMW cheaper and easier than ever.

The tool easily connects to your diagnostic port in the engine bay and allows you to read any codes for a check engine light as well reset your oil service and inspection light with the push of a button.

This tool is a must for the first time do-it-yourself mechanic and to complete any tool box.

Click HERE to order or for more information.


Please let us know if you have any questions! Feel free to shoot me a PM or email.

Best,
Joe
Good to know. I will definitely be buying one shortly. Thanks for the heads up.
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Old 03-08-2011, 05:15 PM   #19
AlpinewhiteXi
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So, its been a couple of weeks weather has been warm with a couple cold days mixed in. I reset the code it came back. Did some research and discovered that the thermostat temp sensor is $15 vs. 50-60 for the thermostat and housing. While deciding too do both or just the sensor the SES light went off and has not come back on for the last couple of days and it has been cold outside. Im begining to think that just the sensor is faulty. Input? Thanks.
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