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#1
12-18-2006, 02:25 PM
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02 ML320 Codes P0203 & P0303
I Have A 2002 ML320 W/96000 Miles. I've Only Had It For 2 Weeks. I Replaced The Battery 1 Week Ago And Then 2 Weeks To The Day The Check Engine Light Came On And It Started To Idle Rough. I Unplugged Battery And Reconnected The Light Went Off And It Ran Great. Later That Night Light Came On Again. Changed Spark Plugs (which Hadn't Been Changed In A Long While) And Added Fuel System Cleaner With Higher Octane Gas. Started To Get Better, Next Day Worse. Took To Autozone And Got Codes:p0303-misfire Cylinder 3, 90203-malfunction Exists In Electrical Circuit For Cylinder 3 Fuel Injector. What Should I Do Next Any Suggestions Please?!
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#2
12-18-2006, 03:36 PM
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either the injector is improperly connected to the wiring harness OR the injector is BAD..
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
12-18-2006, 05:32 PM
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Thank You I Will Check EVERYTHING Tonight. I Have An Appt Tomorrow Am With My Local MB Dealer To See What They Have To Say About This Whole Mess. If The Injectors Are Bad Should I Replace That One Or All (stupid Question I Know) And Would It Be Easier To Have Them Do It Or Should I Do It Myself? (the Spark Plugs Were Fun To Do W/o The Right Tools). Also Will The Computer Reset Itself Once The Problem Is Fixed Or Do The Codes Have To Be Erased?
Last edited by Princess_ML; 12-20-2006 at 11:24 AM. Reason: update
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#4
12-20-2006, 11:25 AM
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12/20 Okay so I took it to by MB dealer and they said it was the injector and that I could change the plugs since it was coming up on 100k miles. That makes me wonder b/c I just changed them-so they didn't even look under the hood?! They did charge me however to tell me all that. Needless to say I am going to order the injector and install it myself. (I'll save 250.00) My only question now is where is the 3rd cylinder? I don't have an owners manual and can't find anything that tells me the cylinder order. Please help me... thank you
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#5
12-20-2006, 12:21 PM
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Quote:
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#6
12-20-2006, 12:59 PM
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Thank you so much azinn. That is exactly what I needed!!
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