CLK430Benz

Hey Guys,

Recently the CEL and these four codes popped up on my OBDII reader: P0171 System too Lean (Bank 1), P0172 System too Rich (Bank 1), P0174 System too Lean (Bank 2), P0175 System too Rich (Bank 2). Moreover, after installing the CLK55 AMG Air Box on my CLK430, every time I floor the car I seem to lose power after 5000 rpm and redlines through every gear. Before, installing the intake I made sure to clean the MAF according to the diy a member posted on this forum. I just want to know what could possibly be wrong with my car?

Thanks,
Steve

CLK430Benz

I did some research and it can possibly be a MAF or a vacuum leak. How do I isolate the issue because I don't want to spend money on something that does not need fixing?

Thanks,
Steve

Ghostrider

You said you cleaned the MAF, so I would make sure that everything went back together properly and all the connections are nice and tight. Its easy for things to get knocked out of whack when working in such a small space.

CLK430Benz

The codes appeared before the install of the new intake. I triple checked that everything is completely clamped and locked up; however, I still get the codes.

Thanks

CLK430Benz

Anyone know?

cindyclk

A very common issue with the airbox is that it is not seated into the MAF housing correctly. When placing the airbox, the rear of the intake must be pressed into the MAF housing first (check that it is totally engaged) and then the front is gently lowered onto the front clips....hope that helps...replacing the MAF is a relatively cheap DIY fix. Get a OEM Bosch from Autohuaz, not an ebay knockoff.

CLK430Benz

The CEL was on before I installed the intake. I checked that the MAF and intake was fitted properly. Now could all this just be a MAF?

Thanks,
Steve

CLK430Benz

BUMP to the top...I need some help.

CLK430Benz

BUMP!...need help please.

rediahad

are you sure those are the code numbers cause alldata doesn't have those numbers just 170 and 173

CLK430Benz

Pretty sure. I attached pictures of the scanned CEL codes from my OBDII. However, now there only seems pick up three codes: P0171, P0174, and P0175.

Thanks

CLK430Benz

Anyone??? How do I know if it is a MAF sensor issue, O2 sensor issue, or vacuum leak?

sick430

P0171 System too Lean (Bank 1) )
P0172 System too Rich (Bank 1) )
P0174 System too Lean (Bank 2) )
P0175 System too Rich (Bank 2) )

sick430

check the 02 sensors,

CLK430Benz

How do I check the 02 sensors...is their a diy?

dlbehrns

There is some way to bench test the O2 sensors and I think there was a post somewhere about it. Do a Search. MarcusF may know. I was not successful with a MAF sensor cleaning. I replaced the entire unit and found out after the fact that you can just replace the sensing element for less $ than buying the entire unit. autohausaz has it and you may have to call to get it. All you need is a torqx drive with a hole in the center to remove the sensor from the housing.

CLK430Benz

Approximately how much for the replaceable part?

Thanks

cindyclk

http://www.autohausaz.com/search/pro...02&cid=22@Fuel %26 Air System&gid=5068@Air Mass Sensor

If you want to do the sensor only, give them a call.

CLK430Benz

So it is def the MAF? Because I already foolishly spent money on a right angle intake tube because I thought their was a crack.

rediahad

Once i get done installing adobe ill post a pdf of the testinf steps alldata sais to do. An if u wanna send me an intake tube pm me the price and a pic cause i need a couple of those

cindyclk

The MAF works with the computer to create the correct air gas mixture. If it is bad the oxygen sensors then detect screwed up mixes. Getting a genuine (not ebay) MAF sounds like the best advice in your situation....my 2 cents

CLK430Benz

The intake tube is the right angled boot, installed prior to the MAF.

rediahad

that is the airbox isn't it? i just need those tubes that come from the front grill into the airbox

CLK430Benz

Sorry, that I do not have.

CLK430Benz

CAR IS IN COMPLETE LIMP MODE! How do I isolate the issue to see if it is a MAF or and O2 sensor? I do not want to buy a MAF and then find out its an 02 sensor.

ANY HELP IS APPRECIATED!