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"SERVICE ENGINE SOON"
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#2
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autozone will scan it for free before you take it to the dealer. or pay a mechanic somewhere $5 to scan and read the code to you. thats what i do all the time. before you take it to the dealer make sure you know whats wrong with it or they will just rob you, but in your case your car still has warranty on it, why not let the dealer scan the code?
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2002 X5 3.0 Siena Red Premium, Cold Weather, Rear Climate Packages, 19" Wheels Aluminum Running Boards, Clear Tail Lights, Clear Side Markers Titanium Kidney Grills, Titanium Trunk Lid, Xenon Headlights 4.6is X5 exhausts, 35% Tint, Aluminum Pedals 2005 530I Mystic Blue Premium Package, Sport Package, Xenon Headlights 18" Sport Wheels, 35% Tint all around Mods to come: M-Tech Front Bumper, M5 Side Skirts, M5 Rear Bumper Quad Exhausts, Style 172 19" Wheels |
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The single most common cause of the SES light is the gas cap being loose. It can be cross-threaded, or just not tight, and if it doesn't seal there is a fault due to the evaporative emissions system controls sensing a leak. Any chance the vehicle was refueled the day the light came on, or the day prior?
Check the gas cap, tighten it up, and see if the code goes away within a day. It won't go out immediately, but it will self-reset. If not, book it at the dealer. If it isn't the gas cap, it is more likely to be a sensor than anything internal in the engine. Good luck.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#5
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My wife did fill the tank 3 days prior the SERVICE ENGINE SOON light came on. She hasn't driven the car much after that. Anyway I did removed the gas cap, although it was closed properly, and re-installed it. The light still remains on. Is the resetting of the SERVICE ENGINE SOON light, assuming it could be the gas cap not installed right, by any chance time sensitive or milage sensitive? Also, can the butterfly oF the exhaust valve located at the right exhaust chrome tail pipe cause this SERVICE ENGINE SOON light to come on if defective? I do hear a ratchetting noise about 1 or 2 seconds after the car turns on and the butterfly of the valve almost closes, but not completely. I do notice once the car is off that the butterfly opens completely. Is this the way its supposed to work? Is that noise normal on 2007 X3s? What exactly is the purpose of that valve on the tail pipe?
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Update on the SES light. Today I took the X3 to work, about 13 miles drive and about 7 days after the SES light came on. I requested an apointment for today, with the dealer, for the SES issue. I was supposed to have taken it afterwork. After I finished work, I got in the X3 turned the ignition key on and the light illuminated for 2 secs or so and then it turned off by itself. Apperently, it was definetly the refueling that some how tripped the system. And I guess the driving caused it to reset. Anyway peeps thanks to all for answering this thread. Specially JCL! You were right on the money, with regards to the most common SES indicator comming on issue. Hopefully, this helps out other bmw newbies, like me, in the future.
Thanks again! |
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Glad it worked out.
Jeff
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#8
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On my 06 the cap was bad and that light was on all the time. I took that thing to the deal at least 20 time and each time I told them "I think the cap is bad" and each time all they said was "can't duplicate the problem". The car was under warranty and they wouldn't give me a new cap no matter what I said. Finally I wrote a letter to BMW and within a few days the dealer called to ask me to bring the car in. I told them the "I think the cap is bad" they gave me a new one off I went and off went the light forever. |
#9
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However, it appears that the SES light is also involved. The manual says that the SES light will come on if the cap is opened while the engine is still running, and that the check gas cap light will come on if the gas cap is left loose after the vehicle is restarted. Seems a bit complicated to me, but I guess it kept another design engineer employed for a few weeks. I don't know for sure, but I suspect that the gas cap light is triggered by a mechanical contact on the cap, and that the SES light is triggered as always, by an out-of-range pressure reading in the fuel tank and carbon canister evaporative emission control system, most usually caused by a loose cap or cracked hose. It appears that this may have been the problem the OP had if in fact reseating the gas cap fixed it; if not, I would still go with a sensor as the most likely culprit. Thanks for the post, DWill.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#10
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SES light on again!!!!!!!!!!!!!!
It happen again! Yesterday, I put gas and today the SES light came on again. Well, about a week or so ago I bought a code reader (ACTRON CP9180) and decided to to read the OBD codes. It turns out I get the P0326 code which says is a knock sensor. The gas that I put is BP (premium). I was previusly using the premium gas from COSTCO. Anyway, I did a reset and the SES light went out (off). I didn't hear the engine make any knocking noise nor the car felt rough when driven, at the time the light was on. And the light so far has not come on since I did the reset. My questions I guess are, can refueling cause the SES light to come on with a P0326 code generated from the OBD computer, even though I used always the correct fuel octane? And if I do have a bad knocking sensor, how come it doesn't come on after I do the reset? Knocking is the result of detonation, and detonation is caused by improper ignition of the fuel. Any idea guys why I'm I getting the P0326 code when I do the refueling?
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