[jpuzas]

Hi Everyone,
I am getting DTC P2096 Post Catalyst Fuel Trim System too lean Bank 1. From what I have read about it, it seems to be caused by the brain thinking that not enough fuel is being delivered. Most common causes are vacuum leak, broken/clogged injector(s), hole in exhaust upstream of O2 sensor, failing Mass Air Flow Sensor.

I was also getting a DTC pointing to a bad O2 sensor so I replaced all 4 of them as the car has 175K miles and I figured it was time. I was getting the DTC P2096 prior to changing the O2 sensors and it remained after I changed them.

I have looked at the Short Term fuel trim and it is at 99% which as far as what I have read is a very high number. This is consistent with the DTC description in that it is adjusting the mixture to deliver more fuel.

The vehicle is a 2005 E500 4matic Wagon 175K mile on odometer.

Has anyone had this problem and solved it? I am looking for some initial direction on where to start looking.

 

[Noodles]

Did you use the specific Bosch O2 sensors? If so other things to check would be the air filters and clean the MAF with using only MAF cleaner.

I am assuming you have inspecting the hoses and lines for a vacuum leak.

 

[jpuzas]

I did use Bosch OEM part numbers and the cables and connectors fit perfect. I have not checked for any vacuum leaks as I would not know where to start What does one do? Just look around for something that looks amiss? Would there be a hissing sound? Is there a procedure for cleaning the MAF? Thanks in advance for the advice!

Jeff.

 

[Michael1216]

2007 E350 4matic P0011 and P0022

Hello

I just bought a 2007 E350 with 112k good condition. Drives great and smooth feels like nothing is wrong.

No check engine but when I scan with regular obd2 I get p0011 and p0022

Also ESP is saying inoperative and cruise is in operative..

Did I buy a lemon with a timing chain issue?

Codes showed up after 70 mile drive back home again NO check engine light.. but they are showing up and the light on my obd2 is yellow not green or red.

I don't know much about these cars but a simple search I came up with maybe it's a timing chain and gears...

Please help if you can.