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Matt, Engineer
Category: Mercedes
Satisfied Customers: 21864
Experience:  Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing
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We have a check engine light going in the Sprinter 2500.

Customer Question

We have a check engine light going in the Sprinter 2500. Took it in to get diagnosed at an independent service outfit. They came back with an error code of P20BD. Based on what I see in the forum, this indicated a DEF heater issue.
JA: Does the light stay on, or does it blink?
Customer: Let me find out.
JA: What is the model of your '500 Mercedes?
Customer: Staying on all o fthe time. 2500 Sprinter, 171" hightop
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: We'd like it repaired in the most cost effective way possible. Haven't tried anything yet.
JA: Anything else you think the mechanic should know?
Customer: We have a mechanically inclined gentleman or two on our staff. Depending on difficulty, we might be able to do it ourselves. How much would we be looking at for parts. I see you indicated it would be about 1.5 hrs labor.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Matt replied 1 year ago.


OK this is a reasonably common issue

the DEF heater is difficult to replace in isolation and often the most cost effective repair is to replace the whole tank with a good used example

it should be part number 906.470.12.15

Customer: replied 1 year ago.
Is that the kind of repair that could be done by an independent?
Could one of my more mechanically inclined employees do it himself?
How many hours would you say it should take a professional to remove and replace entire tank?
Expert:  Matt replied 1 year ago.


yes its a reasonable level of work but no special tools required for re-coding or otherwise

I'd allow about 3 hours to remove and then refit the tank , if they have another built up tank to hand

if parts have to be moved between tanks then add on another hour