Check Engine Light On - Front Carpet Wet (DTB 10M/99-2; MB-NET 286)

CHECK ENGINE LIGHT ON - FRONT CARPET WET

TECHNICAL CAMPAIGN BULLETIN

SUBJECT

DEALER TECHNICAL BULLETIN 10M/99

SERVICE INFORMATION

10M/99-1 RECALLS AND SERVICE CAMPAIGNS: WHEN REPAIRING ANY VEHICLE, ALWAYS CHECK THE VEHICLE MASTER INQUIRY FOR OPEN CAMPAIGNS

10M/99-2 GROUP 07 - MODEL YEAR 99, ML320 (163.154) AND ML430 (163.172) CHECK ENGINE LIGHT ON: After repair of any water leak that may wet the underside of the front carpet, check the terminals of the rear oxygen sensor connectors (G3/6X1 or G3/5X1) for possible corrosion. Repeated wetting of the carpet and the subsequent trapped moisture can lead to the above mentioned connector terminals becoming corroded to the point of causing an oxygen sensor to fail.

1. Minimal Corrosion on Terminals:
   1. Clean terminals.
   2. Seal the electrical lines on the inside of the vehicle coming from the rear of the left (G3/5X1) and right (G3/6X1) oxygen sensor connector with sealant.
      NOTE: To ensure a tight seal, the connector recess should be covered 3 to 4mm thick with sealant.
   3. Replace oxygen sensor that visibly exhibits corrosion at the outer plug (O2 sensor plug).

1. Excessive Corrosion on Terminals:
   1. Replace terminals and plug G3/5X1 and G3/6X1.
   2. Perform steps 2, 3 and 4 from procedure A stated above.

Description	Part Number
Surface Sealant	002 989 73 20 10
Outer oxygen sensor connector plug	036 545 78 28
Inner oxygen sensor connector plug	001 545 68 40
Plug terminals (4 per connector)	032 545 67 28
Oxygen sensor	001 540 28 17

Please use Damage Code: 54055 47