Temp Sensor woes…

[ORB]

Hi folks. I’m new here and I look to learn from your wisdom! I’m fairly handy with spanner’s but don’t much like working on modern stuff suck as my Merc. However I need to safe a few quid!

Recently I got an EML, I scanned it and got the codes:

P0546
P2080

I believe these are related to the exhaust gas temp sensor.

Car was going OK so I thought I’d clear the codes and see what happens. Things got away on me with work and stuff so I continued to drive it and periodically reset the codes and carry on.

Now the car is feeling lethargic, not limp mode but reduced power.

I have now got a code for excess spot in the DPF (annoying!)

I need to sort it so I ask, am I correct in assuming that because the temp sensor is not functioning correctly it’s causing the car to not regenerate?

Anyone know the part no for the temp sensor?

The car in question is my much loved E220 CDI (2014)

It does a trip to work and back every day, it’s 30 miles on the motorway.

Any help would be awesome as I’m looking to save a few quid on the repair!

Thanks again

 

[mioba]

call MB Gangemouth with your reg/vin. they offer forum discount and will post.
You will probably need to shell out for a forced regen unless you have access to a quality scanner.

putting things off only costs more later - nip it in the bud

 

[ORB]

call MB Gangemouth with your reg/vin. they offer forum discount and will post.
You will probably need to shell out for a forced regen unless you have access to a quality scanner.

putting things off only costs more later - nip it in the bud

Thanks for the advice!

Do you happen to know the part no required? Or will them guys at Grangemouth help?

I work in a large garage and we have the latest Snapon diag kit. I imagine this is as good as any bar Merc Star?

 

[Blobcat]

Thanks for the advice!

Do you happen to know the part no required? Or will them guys at Grangemouth help?

I work in a large garage and we have the latest Snapon diag kit. I imagine this is as good as any bar Merc Star?

The parts people at MB Grangemouth are very good and will get you the right one based on your reg/vin

 

[ORB]

Again, thanks guys.

Do you think I’m correct in assuming that the DPF has become blocked by the faulty sensor not being changed?

I’m a tad worried about it

 

[mioba]

WHS above.

As to the snap on tool, I am not familiar with it. Guess you will see once you have changed the sensor and plugged in the tool as to what options it provides.

Good luck!

 

[tpn]

Certainly a duff sensor will prevent a regen and if there is a code you can be sure it will not regen.
Not a good idea to keep driving it.

If it gets to over 250% fill, this is not a soot content per se- exact amount escapes me at the moment- it will not do a regen either.
The snap on is good....and good with Mercs also, but if you need a regen you will need to bring it in the car with you as you cannot do a static regen on a Merc.

The icarsoft MB 11 will tell you everything and will also trigger a forced regen. They are cheap enough to buy and almost a necessity now on these cars.

 

[ORB]

well, I bought the part today. Gonna have a bash at fitting it tonight then see what’s what with a re-gen

I’ll keep you updated!

 

[tpn]

well, I bought the part today. Gonna have a bash at fitting it tonight then see what’s what with a re-gen

I’ll keep you updated!

Very good, you do understand that just fitting the sensor will not allow you to do a regen if the DPF is showing an abnormal fill level with a code, as you previously stated.
When the DPF goes over a certain level a forced regen(after sorting the codes) with the required equipment is the only solution.

 

[ORB]

Yeah, I was kind of aware of that and hoping that it may not be too full to stop a re-gen. If not I will try the machine at work tomorrow (Snap On thingie)

 

[ORB]

Soooo

Update. I’ve changed the sensor tonight, simple enough but not without drama!

I firstly found that the sensor had welded itself to the threaded sleeve in the manifold, took the lot out and took it apart on the bench in the vice. Threads were chewed up and spent ages cleaning up the sleeve.

Also managed to snap one of the vacuum tangs on the turbo actuator solenoid, I’ve bodged it with glue for now and will replace asap.

I’ll take it to work tomorrow and try a forced re-gen on the snap on Zeus. Fingers crossed.

On a side note, I’ve now got code P2600 “Coolant Pump Control open circuit” - I’m assuming this is because the vacuum was lost when I broke the spur on the solenoid? *pray*

I hate modern cars, I’d run my Impreza if fuel was not so ****** expensive!

 

[tpn]

Probably, I expect that you will have to delete that code permanently-fix the problem and delete-before it will allow a regen.

 

[ORB]

Regen completed successfully (I know it’s at 5%, that’s just where I took the photo.

I’ve also replaced the sensor I broke.

Thanks for all your help people

 

[mioba]

Result - good stuff

 

[tpn]

That is a 5% fill not 5g of soot, so it is ok from that point of view. In normal driving it will get up to 5% fill in a very short time.
At 20% fill or so, it will show 1g of soot and at 100% fill it should do its standard regen.

You are not always out of the woods with just a forced regen.

The regen is shutting down at that photo time, as the upstream temp is gone back to 255c, too low to continue a regen.
If you get the revs up a bit again during the 45min window-not required for an ordinary regen- the temp may increase and bring it down to zero.

What you do need to do is to monitor the fill level and see if your car is doing an "ordinary" automatic regen at 100% fill.
Only then is everything ok

 

[ORB]

That is a 5% fill not 5g of soot, so it is ok from that point of view. In normal driving it will get up to 5% fill in a very short time.
At 20% fill or so, it will show 1g of soot and at 100% fill it should do its standard regen.

You are not always out of the woods with just a forced regen.

The regen is shutting down at that photo time, as the upstream temp is gone back to 255c, too low to continue a regen.
If you get the revs up a bit again during the 45min window-not required for an ordinary regen- the temp may increase and bring it down to zero.

What you do need to do is to monitor the fill level and see if your car is doing an "ordinary" automatic regen at 100% fill.
Only then is everything ok

Yes, thats what the guys here told me, they said to run it for a few days and we will plug it back in and have a look.

 

[ajlsl600]

Certainly a duff sensor will prevent a regen and if there is a code you can be sure it will not regen.
Not a good idea to keep driving it.

If it gets to over 250% fill, this is not a soot content per se- exact amount escapes me at the moment- it will not do a regen either.
The snap on is good....and good with Mercs also, but if you need a regen you will need to bring it in the car with you as you cannot do a static regen on a Merc.

The icarsoft MB 11 will tell you everything and will also trigger a forced regen. They are cheap enough to buy and almost a necessity now on these cars.

You. Ain't wrong. I am thinkin on leavin it plugged in permanently with a longer lead.!!!!!!!!

 

[tpn]

I have driven from Liverpool to Surrey and back with the icarsoft plugged in when my inlet manifold was leaking. Any time I over did the acceleration and the light came on I removed it while continuing to drive

 

[ajlsl600]

I drove back from France to UK exactly Same way. Basically clearing fault every morning