Affected Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

Date Published
AUG 03, 2023
NHTSA TSB #
10241534
TSB Document
Summary
In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC (“MBUSA”) is extending the warranty coverage on the exhaust valve system in certain Model Year (“MY”) vehicles listed below from the original New Vehicle Limited Warranty of 4 years/50,000 miles to 15 years/150,000 miles (whichever occurs first). This extended warranty applies to the condition described below that may necessitate the repair or replacement of components related to the exhaust valve assembly (e.g. exhaust valve, cylinder head). • The valve guide and/or seat ring may wear over time due to increased lateral forces during operation. This could potentially cause combustion misfire for cylinder 1 through 4, resulting in an activation of the check engine Malfunction Indicator Lamp (“MIL”). Please be advised that all repairs being claimed under this extended warranty must have a Quick Test uploaded with the following fault code information, and may be audited. • P030085 – Combustion misfire has been detected • P030x85 – Cylinder x misfire detected. (x = the affected cylinder) • P1CEF85 - Injector injection quantity adjustment for cylinder balancing has almost reached the upper limit value at atleast one cylinder. • P1CE577 - Injector injection quantity adjustment for uniform mixture formation has detected an excessively lean mixture at atleast one cylinder. All repairs found to be functioning properly or without proper documentation will be returned and the claim debited in full. Only the following damage codes and parts may be claimed for the aforementioned repairs: Damage Codes: • 01201 – Cylinder Head • 05202 – Exhaust Valve • 01205 – Valve seat ring exhaust valve • 01206 – Valve Guide Exhaust Valve