culbreathj

OK newbie here and I'm trying to find some info on way my check engine light is on and how to fix. I did borrow a code reader from my friend and came up with the following codes;

PO173 Fuel Trim malfunction Bank 2
PO170 Fuel Trim malfunction Bank 1
PO130 O2 Sensor circuit malfunction Bank 1 Sensor 1
PO150 O2 Sensor circuit malfunction Bank 2 Sensor 1
PO156 O2 Sensor circuit malfunction Bank 2 Sensor 2
PO136 O2 Sensor circuit malfunction Bank 1 Sensor 2

I have done some research on this site and others to see if I can find the answer but no luck so far. I just don't want to go spend money on 4 O2 sensors if that is not the problem.

I bought this car a few years ago used no real problems at all and love the car.

It is a 2001 CLK430 cab made in 12/00 with 80k miles vin#WDBLK70G11T073079 and no engine mods that I now of.

Any help would be appreciated

gregory13lil

The codes are VERY typical for a bad MAS Mass Air Flow Sensor. The chances of having all 4 of the O2 sensors go bad at the exact same time are ver slim to none. There was a guy here selling a brand new MAF for 150, I would get it and fix the problem.

Greg

raymond g-

i'm inclined to agree with gregory. since it's free, have you tried removing
and cleaning the MAF element with MAF cleaner? spray can costs about $10
or less. odds are against a simple cleaning but heck, for $10, i'd try that
first before the $100+ for the MAF insert.

A4 Turbo

Its your MAF, i had the same problem with a 01 clk430 and replaced the MAF myself and had a shop reset the codes and i was good to go! Its very easy to do yourself

A4 Turbo

make sure you buy a BOSCH MAF not some cheap ebay one, that can cause more problems. I got mine from here

http://www.autohausaz.com/search/pro...0Mass%20Sensor

VIPclk320

i just got the same code P0130 bank one sensor one. can anyone tell me where that o2 sensor is located(bank 1 sensor 1) and my car has a little shake to it. i erased the code but the shaking is not gone, when i'm behind the red light and the car is idling it vibrates.

culbreathj

Alright guys thanks for all the help so far. I have cleaned the MAF and disconected the battery for an hour plus. This is not a daily driver but going to put a 100 miles on it and see what happens next, no check engine light at this time and about 50 miles on it so far after the above. Need to get it SMOGed this weekend so I hope this is a fix for atleast this weekend.

Thanks again,
Jack

culbreathj

OK, so the CEL came back on after a little less then 100 miles after the above . Just had a chance to check the codes and now I only have two and they were a couple from before,

PO173 Fuel Trim malfunction Bank 2
PO170 Fuel Trim malfunction Bank 1

Alright guys do you still belive it is the MAF sensor?

Thanks again for the help,
Jack

gregory13lil

I am almost afraid to say that I am sure since I have been wrong before but I also got those codes when I needed a new MAF.

culbreathj

Will I went a head and ordered a new MAF from AutohausAZ from the last comments, installed Thursday and reset codes. No codes so far , but I have not put many miles on her yet. Will have to drive her and see what happens.

Thanks for all the help,
Jack

I will post again if the CEL comes back on