201c-1 Mercedes Jun 2026

Before you replace the valve, confirm the diagnosis.

It is very common for Mercedes enthusiasts to misread handwritten service notes or faded part numbers. You might also see this referred to as: 201c-1 mercedes

The W201 SLS uses special green hydraulic fluid called Pentosin (CHF 11S). A failed valve will leak Pentosin onto your exhaust (producing a sweet, burnt smell) or onto your garage floor. Before you replace the valve, confirm the diagnosis

You’re looking at the Mercedes W201 (190 series) – the engineering-focused compact sedan that defined entry-level luxury in the 80s and paved the way for the C-Class. Before you replace the valve

Replacing the valve is messy but doable for a DIY mechanic with moderate skills.