l pagan

I getting code po172 , I have searched but only find info for the non E55K , so far I changed the front 02 sensors and the spark plugs. Any help is greatly appreciate.

thanks

Plutoe

Get off the couch and google the fault---there are thousands of suggestions. Also get a better scanner.

E55Greasemonkey

Are we supposed to know what P0172 is?

l pagan

if you read what i wrote it says i did a search but could not find anything for the E55K engine just the NA engines with a mass air flow sensor that a E55K does not have.

thanks anyway

E55Greasemonkey

Can you tell me what P3672 means? Because I can't tell you what P0172 does.

Plutoe

It took me five minutes to find the definition of P0172 which equals system to rich-Bank 1
Now you do the same!!

l pagan

I know want it means ,I'm just looking for advice on a possible fix , maybe some one here had this problem, just looking for help, i thought that's what the forum was for to help each other .

C32owner

I'm guessing you got no wideband to confirm that the bank is running rich.. Maybe it was a once off that threw the code. Have you tried to clear the code and drive the car again as see if it returns?

l pagan

Hi , I have done a reset but it keeps coming back, I have replaced the spark plugs, the front o2 sensors, I also have tried looking for a vacuum leak, and checked fuel pressure , I'm starting to think a fuel injector, I'm still doing my research but also looking for any advice.

thanks

E55Greasemonkey

The internet isn't going to fix your car. Stop throwing parts, money, and time at it, and have it professionally diagnosed. That's my best advice.

l pagan

thank you

C32owner

If you want to keep tackling this yourself, then you say you already have done spark plugs.. Then that leaves swapping the coil packs from bank 1 to bank 2.. Swap them over and see if your error code persists or it switches over to the other bank.. Then you know its a coil pack

l pagan

thanks will give it a try, won't hurt just time

sonicc

What's the description of P0172? When you scan for codes it'll say something something rich/lean, etc.
Are there other codes?
Does the car run different?

Most CEL codes aren't model specific. So if you find someone with E350 or E500 that had same code, chances are that's the same issue. And for what it's worth, changing spark plugs almost never fixes a code on modern cars. You'd have significantly decreased performance if sparkplugs were that bad.

SICAMG

We change plugs at the dealer all the time for miss fires. Mostly a cracked plug that shorts to ground.

l pagan

Thanks for all the help, after more testing found a bad (leaking) fuel injector , replace all injectors from fcpeuro and it's all good now. Running smooth

l pagan

Thanks for all the help, after more testing found a bad (leaking) fuel injector , replace all injectors from fcpeuro and it's all good now. Running smooth

C32owner

Excellent, thanks for the feedback. Enjoy it

chawkins2001

I used to get that code, and my oem cats were shot, clogged. Went aftermarket with no cats, made more power and no more codes.