Common problems
Mercedes Diesel Glow Plugs and Glow Relay: Cold Start Fixes
As an Amazon Associate I earn from qualifying purchases. A healthy OM616 or OM617 diesel should start on a cold morning with…
Guide hub
Common problems guides
Rust, electrics, central locking, ABS, starting and the faults every R107 owner meets.
All guides
Common problems
Mercedes W126 Climate Control Problems: Diagnosis and Fixes
As an Amazon Associate I earn from qualifying purchases. Automatic climate control on a W126 can keep a large cabin evenly comfortable,…
Common problems
W124 Head Gasket Failure (M103/M104): Signs, Cost and Prevention
As an Amazon Associate I earn from qualifying purchases. On a W124 six-cylinder, a tired head gasket is one of those faults…
Common problems
Mercedes W123 Vacuum Door Locks: Diagram, Diagnosis and Fix
As an Amazon Associate I earn from qualifying purchases. Central locking on a W123 is a vacuum system, not an electric actuator…
190E / W201
Mercedes 190E Common Problems (and the Cosworth Ones)
As an Amazon Associate I earn from qualifying purchases. The Mercedes 190E (W201) is the compact classic that people buy when they…
Common problems
W124 Biodegradable Wiring Harness: Symptoms, Cost and DIY
On many mid-1990s W124s, the engine wiring harness is not a footnote — it is the job that decides whether the car…
Common problems
Where Does a W123 Rust? A Complete Rust Check
As an Amazon Associate I earn from qualifying purchases. Rust decides more W123 deals than horsepower figures. Paint can hide it. Undercoating…
Common problems
R107 Interior Lights and Courtesy Lights Not Working
Why R107 interior and courtesy lights stop working: door jamb switches, the dome light, footwell lights, the trunk light, fuses and bulbs.
Common problems
R107 Trunk Leaks and Trunk Lock Problems
Where water gets into an R107 trunk, how to fix the trunk seal and taillight gaskets, how the trunk lock and central locking work, and spare well rust.
Common problems
R107 Power Mirror Not Working
Which R107s have power mirrors, how to test the switch and motor, what goes wrong in the door wiring and how to replace mirror glass.