CoolBDPhenom03

Got the P0171 and P0174 codes yesterday. I already tried reflashing the tune and clearing the codes. I know it could be a host of issues (intake manifold, purge valve, hose, air filters - very doubtful). May be something the new tune revealed or may be completely unrelated. I'll have to see what the dealership discovers tomorrow.

Long story short, turns out I don't have the extended warranty I thought I did. I'm too dejected to write out the whole ordeal right now, but thanks for listening to my rant.

khmergod

USCGTO

Not quite sure, what you meant there.

You thought you had extended warranty, but you don't? Was it certified pre owned?

CoolBDPhenom03

I had elected to go with Route66 when I applied for my PenFed loan, but I never received any communication explicitly saying that AMGs were not covered and that they would not add it. Therefore, I assumed it was in force. Today I found out nothing exists in PenFed's nor Route66's systems. If that had been made clear, I would've purchased a warranty when my MB warranty expired 9/2012. Then that would mean that this issue would have been covered. I really can't explain how this fell through the cracks and no one else can offer me an explanation. It's extremely frustrating. I specifically desired an extended warranty because of my research of the headbolt issues. I would've been foolish not to.

ZephyrAMG

Lets all calm down...why dont you OBD port it and find out what the codes exactly are...Does the car still run ok? Does it idle ok? You will need to do some trouble shooting at the very least. Disconnect battery, reset ECU and reflash along with checking filters. The purge valve could also be it like you mentioned. My car had purge valve issues from day of delivery....

This whole tune thing is scaring me...I have yet to hear of a car with a tune that won't eventually act up and throw a code...

CoolBDPhenom03

I did have a friend read the codes with an OBD tool. I have screenshots of the codes and it's what I've described. My shop friend also noticed that the car is a little hesitant at start up and the idle is a little rough. Also, last night, after some spirited driving, the CEL began to blink, which I've read is very bad.

Normally from what I've read, CEL issues resulting from tunes has to do with O2 sensors because cats have been removed.

Anyway, I'll find out more tomorrow when my SA takes a look and runs a smoke test.

abcut973

Man this is definitely not what you expect when getting a new tune
I hope everything will be sorted out soon for you.
That is really a tough luck for the warranty. Keep us posted.

CoolBDPhenom03

Well, this may have nothing to do with the tune. I'm more upset about the warranty issue. I feel totally shafted.

johnnyblaze

Do you have drop-in filters or ROW boxes?

EkS

How many miles on your car?

Blinking CEL means that it's misfiring. If you read the codes after the blinking CEL it'll tell you which cylinders.

m a x i m u s

did they charge you for the warranty?

CoolBDPhenom03

Drop-in K&Ns, which have been on the car since I got it.

I just cracked 50k miles last week. The OBD II scanner didn't read any misfires, but then again, there may be certain codes only MB can read.

I'm not sure. I had difficulty digging up the paperwork in my mountains of files, so I'll have to check. I think I see where you're going...if they did charge me for the warranty and I'm not supposed to be eligible, then I could make an argument that they should cover it since they took my money.

Rsquad911

Could be a coil pack.

Did it sputter when the CEL started flashing?

m a x i m u s

they are in the business (among other things) of selling extended car warranties. you are just a consumer who isn't an expert on these things. they need to make it right, especially if they charged you and you paid.

CoolBDPhenom03

No, but it was running rough...like the one time I had misfires. But that time, the dash lit up all weird. This time, the blinking light went back to solid after a few seconds. I restarted the car and it was running okay.

Well, I was too aggravated to keep looking for the documentation, but I will, eventually.

Pertplus

No you make the argument that by being charged, you justifiably relied on the fact that you were covered under a warranty and therefore did not go and purchase another one. Even if they didnt charge you, you can sue (yet there's no guarantee of success) for whatever you ended up paying for the problem to be fixed that would have otherwise been covered under the warranty you reasonably believed you purchased.

SoFlaC63

P0171- system to lean

P0174- another lean code

Those to codes make me jump mani gaskets or some sort of leak. Those maf sensors read A and register A to the computer. If A isnt actually present then it can cause running rough problems.

You can do some of this diag. by yourself. Just about any OBD2 scanner will draw misfire codes so if they weren't there i wouldn't sweat it.

If those are what you saw this is where i would start. Go to autozone and buy a can of brake cleaner. Go home, turn your engine on and pop your hood. Brake clean is combustible. If you have a intake gasket leak, it will draw in the brake cleaner and cause the engine rev by itself. This could confirm a intake manifold gasket leak. This would cause a lean code. Also while your at autozone buy a can of maf cleaner. This is a insurance policy. Just clean the mafs. Takes two seconds.

In my experience if the tuner forgot to disable the check engine light for one of your sensors in your exhaust, it WOULDN'T cause your car to run bad. Just have the annoying light on the dash. Plus that light would be on there from day one of the flash being the ECU. If it wasn't there from day one when flashed then its not related.

EkS

Your O2 sensors might be bad.

As for your warranty, check your PenFed account online. Look at your transactions. At the beginning of the loan you will see the loan amount and the warranty amount, if charged.

SoFlaC63

^^^ this also. I dont have the full readout of those codes but usually it will say P0171- "lean than bank 1 or bank 2. Those codes are usually associated with oxygen sensors. Bank 1 and Bank 2 would be the sides. Lucky for us we have 4 of them lol. Im sure they runs well of 160 bucks each. A tech may have to Diag. which one or ones are bad if thats the case.

andrew c230k

I got this code when I pulled my carbon filters when running K&N... if you have your stock paper filters or carbon filters put them in i bet your codes go away and never come back.

CoolBDPhenom03

I'll check my account tonight.

Would faulty O2 sensors cause misfiring and rough idles?

The filters can't be the issue. I've had them since Vivid installed them...so over 28,000 miles. Never a light before.

EkS

Yes

Do you have headers?

CoolBDPhenom03

Well, I'd take that or one of the other lower cost options over an intake manifold issue. We'll find out tomorrow.

dc5itr888

I just got a CEL P0171 as well...

Read some threads with it being purge valve, charcoal filter, gas cap

roadtalontsi

its probably just intake manifold gaskets. What are the odds of both o2 sensors just all of a sudden going bad at the exact same time? not common at all. Not having the extended warranty isnt a big deal. the 63's dont have alot of issues. you'll probably be saving yourself money in the long run. you should go ahead and consider doing some spark plugs while your at it and with 50k. the flashing means misfiring - it probably didnt happen enough to throw a hard code that your generic ob2 scanner will read but im sure the benz one would pick it up. ignition coils? those go bad about as often as injectors. this isnt an audi