Spark Plugs - Check Heat Range

90mercedes04
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: May 1990
REF.NO. MBNA 15/7
SUBJECT: CHECKING AND REPLACING, IF NECESSARY, SPARK PLUGS MODEL 129.066


On vehicles produced up to October 1989, it is possible that lower heat range spark plugs were installed (heat range 8 instead of 9).

During the next service visit, remove one spark plug and compare to those listed in the table below. If a spark plug other than those listed is installed, replace all spark plugs.


Spark Plug Part Number


Bosch F9 DCO 003 159 31 03
Beru 14 F-9 DUO N/A
Champion C12 YCC N/A


In Case of Warranty:

Time Allowance
02-0683 Spark plug - one, R & R/inspect 0.3 hrs. | 92
15-1031 Spark plugs - all, replace 0.5 hrs. | 92

Claim only one of the above time allowance

Damage Code

15930 07 Spark plug inspection/replacement