MACEDON

Intro:
The temperature sensor degrades over time, I replaced mine on my 12 year old E55 with 95k on the dash. The idea came from this thread: https://mbworld.org/forums/w211-amg/...-godzilla.html
The repair resulted in smoother shifts, quicker response, and a lot more ! on the dash. Definitely woke my car up quite a bit.



Summary:
Replace Air Temperature Sensor - in Intake Manifold, (2 Pin Connector) Part #: 651-153-00-28-MBZ
http://www.pelicanparts.com/catalog/..._pg1.htm#item2
(I used MB OEM, might be available elsewhere for cheaper)



Clean throttle body, instructions are available here:
https://mbworld.org/forums/w210-amg/...t-results.html

Perform a sneaky ECU reset to reset the throttle body and start from scratch
https://mbworld.org/forums/w211-amg/...set-works.html






Tools:
Small flathead screw driver
Small pliers
Throttle body cleaner spray
Shop towels







Procedure:




Begin with a cooled engine bay, it helps a lot.



Remove the intake assembly, this video does a very good job at explaining:

You Tube

(I removed that little rubber hose from the intake itself, the video states to remove it from the bottom, avoid, it's harder).

The sensor is located under that metal hose. At first it seems tricky to do, but it isn't really.












Remove the air intake sensor from its seat, initially, only remove the sensor, do not touch the cable. BE CAREFUL with the cable, it seems very hard to replace. Examine your new sensor to understand how it works.

NOTE: Remember the orientation of the sensor in its original position.

I used a very small screwdriver to break the plastic pieces holding the sensor inn place, there might be a better way to do it but this works. Carefully pry the little plastic legs with a small thing screwdriver, at the end your part will look like this:



Once you have the little legs broken, use small pliers to carefully pull it out of its seat.



Then, use the small flathead screw driver to remove the connecting cable. Be very careful. Examine the new part to understand how it works.



Finally, reinstall the new sensor in the correct orientation (the ridge for the connector should be facing the rear of the car). Simply seat the sensor and push down for it to snap into place. Then connect the wire. Easy!

That's it. Donezo.




While you're here, clean your throttle body: https://mbworld.org/forums/w210-amg/...t-results.html

Reassemble your components, very easy but be careful with the intake assembly as you slide it back onto the throttle body, don't forget that rubber hose.


Finally, perform a sneaky ECU reset https://mbworld.org/forums/w211-amg/...set-works.html, hop in the car,and FEEL THE POWER

skylinrcr01

So it really was noticable? Maybe I'll do mine too.

MACEDON

I can't exactly say if it was the TB cleaning or the sensor but I would imagine. I wonder if any results will come from putting in a new MAF

If you do it try it without cleaning your throttle and see if it makes a difference for you. If yes then we are onto something.

skylinrcr01

Well, I ordered one. I guess we'll see. For $9 I'm willing to roll the dice.

SMed08

I've ordered one too. Will do without cleaning throttle body first and see what happens.

Likely do without doing sneaky ECU reset too, as I just did one the other day. I'll do each separately and see which, if any single change, makes much difference.

jumph4x

Sweet, will give this a go.

elf

I also ordered one off eBay earlier today as my 04 E55 has 121k currently on it. Just changed out all the coil packs and spark plugs now waiting on this air temp sensor to come in the mail. I also ordered a Innovate Motorsports DLG-1 Dual Lambda Air Fuel Ratio AFR Wideband O2 Gauge to hook up to monitor AFR accurately. I probably should clean my TB as well but let's see what the new sensor does.

http://www.ebay.com/itm/151714739476...%3AMEBIDX%3AIT

CarbonHan

do you know if this applies to the m156?

supreame

It looks like if you pull the plug first you don't have to snap anything. Pictures from a W124 but sensor and connector look similar.

s.i.f.i.

After digging through my paperwork and finding no evidence of this item having been replaced, I bought one. I figure in my case the tired sensor was costing me a Beetle's worth of hp, maybe more. Immediate noticabke smooth idle at lower rpm, more Go across the range, totally worth it. Better yet, I've been resetting a code for secondary smog pump not lighting the cats off fast enough that has been there for months, and which has been recurring more and more frequently. 5 days now and that code hasn't come back. Accurate IAT info is important!

MACEDON

You'll see that when you do try to do it it's pretty impossible to grab on the E55

LandCruzer94

Ordered. 99k miles on mine and with previous hiccup issues Ive been keeping my TB pretty clean. Ill be able to give a good estimate of the sensor change alone.

C32owner

Awesome please do share, I might just have to do mine

PieRat

Picking mine up tomorrow

MACEDON

After doing this, cleaning TB, and now putting ethanol free in the tank I am happy to say my car is the smoothest running it has ever been. Just pure wholesome smooth power every time I step on the pedal. Love it.

SMed08

Going to be a tricky comparison for me, as it's currently having longtubes installed. I'll need to wait a couple of weeks and get used to these longtubes before swapping out the sensor, but it sensor has arrived and ready to go on.

skylinrcr01

Seems like my car benefited from the new sensor, just put it in today, no TB clean. The old one was pretty cooked.


The one I pulled out was a VDO for what that's worth too.

MACEDON

That's good to hear!

C32owner

Ummm.... OK so how does it drive now lol

skylinrcr01

Seems to be a little better, but the butt dyno is a hard thing to trust. Replacing it with a new sensor certainly didn't hurt anything.

C32owner

Cool, ya butt dyno sometimes ain't right. Definitely doesnt hurt to replace with no stuff

skylinrcr01

Yeah but for $8 I was willing to risk it. The old one looked pretty cooked too, and it wasn't original, since it was missing that silver AMG sticker.

MACEDON

I think it's just overall improved response, a lot like getting a MAF or cleaning the throttle body

Toadster

Mercedes (1993+ models) Temperature Sensor at Intake Manifold 2 Pin $12

PieRat

Yes the engine management is improved by accurate inputs. I get a smoother idle (still not perfect hoping a map sensor will do it, but I have no cat's and kleemann's so I don't think I can expect a smooth idle. I haven't had as harsh supercharger clutch engagement since I replaced the sensor.