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Mercedes Benz 420 Problems

The Mercedes-Benz 420 was a V8-powered variant of the W126 S-Class, offering excellent performance with legendary Mercedes build quality. With 182 complaints and no fatalities recorded, the 420 represents Mercedes during its engineering-first era. The 4.2-liter V8 provided smooth, adequate power, while the W126 chassis delivered ride quality that remains impressive decades later. These cars have become collectible classics.

182
Total Complaints
0
Total Recalls
11
Model Years
0
Reported Deaths
!

Years to Avoid

These years have significantly more complaints than average.

1997
✓

Best Years

These years have the fewest reported problems.

1987 1988 1989

Common Problem Categories

Electrical System 30
Suspension 26
Service Brakes, Hydraulic 14
Vehicle Speed Control 12
Power Train 12

Complaints by Model Year

All Model Years

Year ↓ Complaints Recalls Crashes Fires Rating
1999 20 0 0 0 Average
1997 48 0 2 2 Avoid
1996 4 0 0 0 Good
1995 32 0 2 4 Below Average
1994 34 0 4 0 Below Average
1991 8 0 2 2 Good
1990 6 0 0 0 Good
1989 4 0 2 0 Good
1988 2 0 0 0 Good
1987 6 0 2 0 Good
1986 18 0 4 0 Average

Mercedes Benz 420 Years to Avoid

The 1997 model year shows elevated complaints, though by this point the 420 designation applied to the W140 S-Class. W140 models, while well-built, introduced more complexity than earlier cars. For W126 420SEL buyers, the 1988-1991 models require careful inspection for aging issues including vacuum system degradation.

Best Mercedes Benz 420 Years

The 1988 model year represents the W126 420SEL at peak refinement. By 1988, Mercedes had sorted all issues with this generation, and the 420SEL offered excellent value within the S-Class lineup. These later W126 models combine the best engineering with years of production improvements.

Frequently Asked Questions