Check engine light on and off - Mercedes-Benz Forum

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post #1 of 19 (permalink) Old 09-28-2007, 09:57 PM Thread Starter
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Check engine light on and off

Two days ago, my 1999 Mercedes-Benz E430
suddenly, the check engine light is ON
Yesterday, I went to Auto Zone, the man pulling out the code said

You need to change the oxygen sensor

I am a little suspicious, since he don't even check the code online or from any
manual, just say that after look at the code, and he is not sure whether buy the oxygen sensor would fix the problem, so I did't buy the sensor there there

Then, today, after check engine light ON for several drives, the final drive home, it's OFF, OH, peace of mind
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post #2 of 19 (permalink) Old 09-29-2007, 05:45 AM
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Peace of mind!!!! Get the actual code. I think the O2 sensor code is P0163. I think. If it needs to be changed-CHANGE IT!!! If you leave it, you run the risk of the car running rich. You could have a series of problems including problems with your catalytic converter. Do not leave this unresolved. You will likely end up with a major repair bill and have to change the sensor anyway. Replacement of the O2 sensor is normal maintenance. You can get a replacement at autohaus az.

Mike
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post #3 of 19 (permalink) Old 10-01-2007, 02:51 PM
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MP is right ..... what's the mileage on your Benz? These sensors normally need to be changed every 60,000 miles.
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post #4 of 19 (permalink) Old 10-01-2007, 05:03 PM
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echaocn Pls complte your PROFILE - Vehicle & Location.

Welcome to the BW Forum,
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post #5 of 19 (permalink) Old 10-01-2007, 05:49 PM
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take it to a benz dealer cause generic(sp) codes for o2 sensors are some times set by the mass air flow sensor. i had one not even a week ago e320 came in from emissions with a fialed notice. the codes on the report were for the o2 sensor. but after diaging the car found it to really be a mass air flow sensor.. im not saying its not an o2 but i would def get the real deal on the codes. there not always what they seem.

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post #6 of 19 (permalink) Old 10-01-2007, 06:55 PM
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Quote:
Originally Posted by echaocn View Post
Two days ago, my 1999 Mercedes-Benz E430
suddenly, the check engine light is ON
Yesterday, I went to Auto Zone, the man pulling out the code said

You need to change the oxygen sensor

I am a little suspicious, since he don't even check the code online or from any
manual, just say that after look at the code, and he is not sure whether buy the oxygen sensor would fix the problem, so I did't buy the sensor there there

Then, today, after check engine light ON for several drives, the final drive home, it's OFF, OH, peace of mind
Hi, echaocn, and welcome to the forum. Please take a moment to complete your online profile re: vehicle and location.

You posted in the general forum, which is okay, but since you drive a W210 there is a forum specific to that model, which coincidentally is the W210 forum. If you scroll down the main page you'll see it listed. Whenever you have a question or concern related to your E that's probably going to get you better info than posting in the general forum.

That said, while you can go to an MB dealer and pay them a boot full of cash to download your codes and diagnose them for you, you could instead buy a code reader and own it for much less than they will charge you for this single instance. If you have a Harbor Freight in your area they have one for $40 that comes with a CD relating to codes. Or you can get one other places for under $100. Following the directions you'll get one or more codes and then you can google them or search this site for them, or post up in the W210 forum where the other folks will help you. Personally I think if you own a late-model benz you should own a code reader. These engines are very refined and meeting ULEV standards they have a narrow range within which they're "happy". Meaning, of course, that they have a greater tendency to throw codes than do non ULEV and more basically-engineered vehicles. If you run to the dealer every time you get a CEL, you'll be broke and unhappy and dissatisfied. On the other hand if you feel really badly for your MB dealer, that he only has a cabin-cruiser and the BMW dealer has a yacht, well, run on down there.

Honestly, and with all due respect to ctbenztech, I hear as much bad stuff about MB dealers and their code diagnostics as anyplace else, which of course means it's not the dealer, but the tech. With the combined experience in the W210 forum you're as likely to get to the bottom of it by posting the actual codes as you are heading into the dealer. The big difference is you won't have to pay us for helping you out.

Of course, if for some reason you don't want to purchase a code reader, head back to Auto Zone and go out to your car with the kid, and write down the codes that it actually comes up with (again, bring them back here and search, post in the W210 or google them, don't just take the AZ guy's word for it). There are four O2 sensors on your car and unless you're good with wiring (so you can buy the generic ones) you'll have to purchase the OEM type, probably around $350 to $400 at discount online prices for all four. Some folks are of a mind that if one is going, I'm just going to replace all four, that's something you'll have to determine for yourself. Depending on mileage I would probably just replace whichever one(s) is(are) related to the specific code(s). (In deference to Ruudje, I believe Bosch actually recommends a 100,000 mile replacement on the newer engines...) And again, with respect to ctbenztech, in my mostly-anecdotal experience it's rare that a single O2 code results from a MAF; the MAF codes are quite specific (left and right fuel trim together, not just one of them; I don't recall the "P" codes off the top of my head) and personally I wouldn't go replacing a MAF sensor if I had a specific O2 sensor code. As ctbenztech notes, getting to the bottom line of a diagnosis can sometimes be a bit tricky, but in my experience, if it walks like a duck and quacks like a duck, it's usually a duck. No reason to look for squirrels initially.

Last thought: The nature of these ULEV engines is that they are pretty sensitive, even bad gas can occasionally trigger codes that go away on their own, and they could be MAF or O2 or (single) fuel trim or... Point being that a single blip of the light doesn't necessarily mean you actually have a part that has failed. And if it's back in range with the light out, you can comfortably drive it around as usual. If it blips more and stays on longer, then you know you very probably have an issue, if not, it could easily have just been a transient that won't return.

Again, welcome to the site, and come see us in the W210 forum.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)

Last edited by Check Codes; 10-01-2007 at 06:57 PM. Reason: Wasn't long enough...people were still awake!
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post #7 of 19 (permalink) Old 10-02-2007, 05:37 AM
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The MAF usually kicks out the P0170 and P0173 codes. Even with that, remove the insert and clean it. Any time there is a code you have to deal with it. It really comes down to find out exactly what code was kicked out. Even if the CEL is not on, the code should be stored in memory.

Mike
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post #8 of 19 (permalink) Old 10-02-2007, 06:03 AM
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I cant speak for your part of the world, but here in China, when I see an 02 fault code, firstly clear the code then add MB fuel addative and give the car a good drive, it works 9 times out of 10. Bad fuel is a major headache. The parameters for a check engine light are small with the newer engines.
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post #9 of 19 (permalink) Old 10-02-2007, 05:58 PM
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wow some people are bitter about dealers. not naming any names but they must have had a bad experience with there dealer. not all are bad. people will learn this when they spend unnessesary money on there cars with misdiagnoses from @!#$ autozone. hey lets bring our $40,000 cars to autozoe to have some idiot pull codes for us. aleast mb dealers will warenty the parts and labor on repairs, mine covers it for 1 year unlimited miles. try going back to auto zone for a refund on your purchased parts they sold you after pulling codes and selling you some junk.or why dont you ask the guy on here that told you it was this when it really was that, for your money back.good luck. well hey its your money do what you want with it. all ihave to say is i make alot of my money off the indipendents @!$# up your cars. good luck with your repair.

mike

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Last edited by ctbenztech; 10-02-2007 at 06:30 PM. Reason: cause i have a potty mouth
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post #10 of 19 (permalink) Old 10-02-2007, 07:23 PM Thread Starter
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Thank you all for your warm-hearted help !!!!

I am just a new beginner here (registered several days ago), had my vehicle and location done.

Actually, I just bought this car two weeks ago, from a very nice guy, extremely cheap. The problem maybe on the drive home from the seller, I filled it with the No.89 Gas(my first time to fill gas). This may be the reason that triger the CEL.

I will fill it with No.91 gas when this 3/4 tank oil goes out. If the problem continues after that, I will buy a tool to diagnose the CEL. Actually, I am just a student, all busy during day time, but I will fix the problem of my car when I get time.

Sorry, guys, I don't know too much about car, don't even know this E430 is also called W210. I will go to W210 forum later more often.


Thanks again for all your help and your reply !!!!
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