C220 Engine diagnostic warning light on

[GeorgeA]

I added Millers diesel additive to my W203 yesterday and drove 25 miles with no problems. From start up today and all day the engine diagnostic light remains on.
The car continues to run perfectly. Checked under the bonnet and everything seems fine.

Can this be attributed to the diesel additive or is it simple coincidence?

Should I wait till this tank of fuel has been used?

Should I get the codes read? There are no malfunctions shown.

Do I need to get the codes read to clear this warning light?

Any help appreciated.

 

[GeorgeA]

Anyone any suggestions?

TIA

 

[Dieselman]

I can't see it being the additive unless it's cleared a blockage and caused a leak such as in the injectors. If so, it was going to happen anyway.

 

[GeorgeA]

I can't see it being the additive unless it's cleared a blockage and caused a leak such as in the injectors. If so, it was going to happen anyway.

OK. I take it that reading the codes will diagnose the problem then?

Could this be an electrical problem?

Most annoying as the car is running fine - gave it a bit of a blast tonight.

 

[GeorgeA]

Local indy read the codes today and the culprit was the diesel particulate filter. Reckons the additive may have been the culprit. MB themselves use an additive to cause the particulate filter to go through its regeneration process. I may have inadvertently caused the same thing. MB state clearly in the manual not to use additives and I shall obey this from now on.

The diagnostic light is now off but should this return the only solution would be to replace the DPF.

 

[Dieselman]

The diagnostic light is now off but should this return the only solution would be to replace the DPF.

I thought there was a modified sensor due to the film coating up. Worth checking.

 

[GeorgeA]

I thought there was a modified sensor due to the film coating up. Worth checking.

I am intrigued but simply do not understand - can you elaborate please

 

[Dieselman]

VOSA recall.

I would also ring Millers and ask them about using their product with a DPF. I thought this was the reason for the new PowerSport4 product.

 

[GeorgeA]

VOSA recall.

I would also ring Millers and ask them about using their product with a DPF. I thought this was the reason for the new PowerSport4 product.

Thanks indeed will mention this recall to my indy in case this would negate the need for a new DPF.

Millers Power Sport 4 is the product I used and it says nothing re a DPF on the bottle. There is a phone number so might just give them a bell. However I will not be adding this or any other additive ever again.

Thanks again.

 

[Dieselman]

Presumably there is some additive left in the tank, which begs the question why hasn't the problem re-occured.
IF that was the cause of the problem it was possibly as a result of existing soot being released and shifted down the exhaust, but the sensor isn't obscured now otherwise the fault would be permenant.

Excerpt from Millers website.
Incorporates many of the key benefits of Diesel Power Plus with the very latest additive technology to produce “better than new” performance. Recommended especially for modern Euro IV compliant vehicles with catalytic converters and diesel particulate filters.

http://www.millersoils.net/1s_store.cgi

 

[GeorgeA]

Presumably there is some additive left in the tank, which begs the question why hasn't the problem re-occured.
IF that was the cause of the problem it was possibly as a result of existing soot being released and shifted down the exhaust, but the sensor isn't obscured now otherwise the fault would be permenant.

Excerpt from Millers website.
Incorporates many of the key benefits of Diesel Power Plus with the very latest additive technology to produce “better than new” performance. Recommended especially for modern Euro IV compliant vehicles with catalytic converters and diesel particulate filters.

http://www.millersoils.net/1s_store.cgi

Looks like there is no need to phone Millers now they claim to have it covered.

I only put one cap full in the tank and within 25 miles the engine diagnostic light was on. I have been filling the car each day in an effort to dilute the additive out. I might add the car did not appear to perform or sound any different - other than the light of course.

I did concede earlier that this all might be a coincidence and I certainly cannot prove otherwise. However, a new DPF on a car with 36k is a bit extreme also. Hopefully this will not be the case.

For those who have used this or similar products and have had good results obviously speak for themselves. All I can say is I have had my fingers burnt and I have no intention of putting my fingers in the fire again.