2007 E320 75000 miles diesel leak
Just recently I changed all 6 glow plugs and 1 month later glow plug controller because CEL kept staying on. Its been 1 month since no CEL with no engine problems. I'm thinking fuel injector issues. Is this a DIY or stealership fix? Thanks in advance.
Pat
Start the engine & have a good look around with a strong torch. Take a look from underneath the engine too. You may have to take the cover off.
Especially if it was replaced ignoring official procedures, i.e. not CLIC clamps, existing CLIC clamps reused rather than replaced, etc.

As advise - replace those clamps as soon as you replace your fuel filter










