Hi!
I had this code come on now for a while, oc2 was change and code P1070 in 01 & 02 keep coming up, usually after the car has run for quite a while. I saw on the tech post references to the air flow censor, and my guest was of the egr valve or the thermal switch to the valve, is this correct and can you tell me exactly what it may be and the fix?

Thank you

use the SEARCH engine on this forum, type in P1070 and you'll get; instructions and where to buy plus additional diagnosti info.

Thanks Ethan

Seems that it's the same thing that I just fixed on a Grand Marqui, just needed some cleaning of air intake. I would hate to replace the air flow meter unless I have to
Thank again

I had the same code and Check Engine light go off on my 1998 C-230, the big thing for me was the funny way the transmission was acting.
I didn't read or check adaptation values and gambled on the MAS sensor, which in deed did fix my problem.

I always thought intake cleaning or repairng of the MAF/MAS sensor wouldn't work, but I did read on one forum ( maybe here or at www.club202.com) someone posted directions on how to attempt a repair on the MAF/MAS.

So far so good my light hasn't come on for afew days after puting the oc2 censor. No isues with the trainy so far! By the way no free speech at (www.club202.com)

What is an oc2 ??

sorry my mispelling, I meant the Lambda sensor or the oxygen sensor (O2).
Light came back on today,I just clean and cleared code ,will see if that helps.
By the way sl 600 cruzin posted on 4/28/05 on low fuel pressure and the fuel filter , that was my original diagnos, got a fuel filter last week ,still have to install it.

That's better! 02

Oxygen = O2

__________________
2007 C 230 Sport.

Thank you I stand corrected, and I installed the fuel filter ,I'll let you know if it does the job (p0170)

Your code means the system is at its max adjustment and can no longer adapt to an air/fuel imbalance..
This can be caused by a lean condition, in which case the vac lines shoud all be checked for possible leaks [ on that chassis , check around the front of the engine, the line that go to the switch-over valves for EGR]

Also can be caused by a rich condition . In that case , a possible is the fuel regulator has a ruptured diaphragm . This can be checked by taking the hose off the reg. and looking for fuel in the hose.. there should be none.
A fuel pressure test is in order to complete this test.
And then , there is the possibility that the MAF is not reporting the correct intake air mass , in which case it is faulty [ a good possibity].. but , the proper sequence is start with the vav leak/fuel pressure first.
Adapatation specs are used for this diagnosis, but that requires equipment , so for the diyer , do the above sequence .
You may just have a bad fuel feed, so you will know with the new filter....
" 02 Sensor "is the proper terminology..

The intallation of the fuel filter has done the job in conbination with cleaning of air sensor , used electrical contact cleaner, will be back when next problem comes up, and thank you all that help in resolving my issue with this p0170 code, for now i will work on my spelling!

Go to your room & write:
Oxygen Sensor = O2 sensor.
100 times !

__________________
2007 C 230 Sport.

Man!!
Spoke to soon!
Fifth & six grade used to make me do that untill I dicided not to do the lines!
The teacher didn't know what to do anymore, another kid had a nervous break down in class and that was it for lines.
now code p0170-02 & p0133 -01

Stop throwing parts at it and have the adaptation codes read.

__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif

Hi! John Shellenberg
Adaptation codes? I use an Obd II code,I guess I should have the mech. look at it. My car idles correctly as far as I can tell, my last try is going to be the second 02
The car did adapt and now no code, the fuel filter must of been the culpit.
sensor.
1997 c230 120,340 miles