Decode Your VIN
Enter your vehicle's VIN code to discover all technical specifications. The VIN consists of 17 alphanumeric characters.
Decode any Mercedes-Benz 420 VIN free. Type the 17-character number from your 420SEL, 420SE, or 420SEC into the decoder above and pull the chassis (W126), model year, engine, plant, and options. No sign-up.
This page is the dedicated 420-Class hub. The 420 badge appeared on the W126 S-Class from 1985 to 1991 with the M116 4.2L V8, an evolution of the earlier 380SEL’s engine bored out and refined. It was Mercedes’ answer to the concerns about the outgoing 380’s timing chain issues and reduced US-market power output.
About Mercedes-Benz 420-badged vehicles
The 420 badge was primarily used on the W126 S-Class:
| 420-badged model | Chassis code | Years | Body |
|---|---|---|---|
| 420SE | W126 | 1985 to 1991 | S-Class sedan (European) |
| 420SEL | W126 | 1985 to 1991 | Long-wheelbase S-Class sedan (European and US) |
| 420SEC | W126 | 1985 to 1991 | S-Class coupe (US and European) |
In the US market, the 420SEL replaced the earlier 380SEL for 1986. It received the enlarged M116 4.2L V8 with sequential fuel injection (instead of the CIS system of the 380), which addressed the power output concerns. The 420 name never spread to the R107 SL or W124 E-Class; those continued with 380SL and 300E respectively.
Mercedes-Benz 420 WMI codes (positions 1 to 3)
| WMI | Country | Plant | Applies to |
|---|---|---|---|
| WDB | Germany | Sindelfingen | Every 420 (all W126 variants) |
How to decode a Mercedes 420 VIN, position by position
Positions 1 to 3: WMI
WDB on any 420.
Positions 4 to 8: VDS
Positions 4 to 6 read 126 on every 420. Position 7 encodes body (sedan, LWB sedan, or coupe). Position 8 identifies the engine:
| Char (pos 8) | Engine | Fitment |
|---|---|---|
| 7 | M116 4.2L V8 (SOHC 16-valve, sequential fuel injection) | Every 420SE, 420SEL, 420SEC |
Position 9: Check digit
Calculated from the other 16. Enforced on US-market 420SEL and 420SEC by NHTSA.
Position 10: Model year
| Char | Year |
|---|---|
| F | 1985 (420SEL launch) |
| G | 1986 (US market launch) |
| H | 1987 |
| J | 1988 |
| K | 1989 |
| L | 1990 |
| M | 1991 (final 420 year) |
Position 11: Assembly plant
F for Sindelfingen. Every 420 was built at Sindelfingen.
Positions 12 to 17: Serial number
Production sequence stamped on your specific 420.
Where to find the VIN on a Mercedes 420
- Driver-side dashboard, visible through the windshield
- Driver-side B-pillar Datacard sticker
- Stamped on the firewall in the engine bay
- Stamped on the strut tower under the hood
- Stamped on the engine block, top rear near the firewall
- Vehicle title, registration
Mercedes 420 known issues
420 owners should watch M116 4.2L V8 chain guide wear (though generally more robust than the 380’s single-row setup), cam and rocker wear on high-mileage examples, and, on 420SEL and 420SEC specifically, the extensive vacuum-operated central locking and climate control systems. The M116 4.2L is considered one of the most reliable V8s Mercedes built in the 1980s once you’re past the timing chain generation of the 380.
To check a specific 420:
- Decode the VIN with the tool above to confirm the exact chassis series and model year
- Cross-reference the 17-character VIN with the Mercedes-Benz USA recall lookup and the NHTSA recall database
- Contact your nearest Mercedes-Benz authorised service centre for any open campaign repair
Frequently asked questions
How do I decode a Mercedes-Benz 420 VIN?
Type the 17-character VIN from the dashboard, B-pillar sticker, or title into the decoder at the top of this page. Results include exact model (420SE, 420SEL, 420SEC), model year, and plant. No sign-up.
Is the 420 the same as the 380?
Same engine family (M116) enlarged in displacement. The 380 was 3.8L; the 420 is 4.2L. The 420 also has sequential fuel injection where the 380 had CIS, which improved power output significantly. Position 8 of the VIN differs (5 for M116 3.8L vs 7 for M116 4.2L).
What replaced the 420SEL?
The W140 400SEL launched in 1991 as the successor, using the M119 4.2L V8. For 1994 Mercedes renamed the 400SEL to S420 as part of the letter-first naming convention. The current S-Class S420 nameplate has been retired and current S-Class variants use S500, S580, S680 designations.
Is the Mercedes 420 VIN decoder free?
Yes. VinDecoderPlus decodes every 420 VIN free of charge with no sign-up.
Can a 420 VIN be faked?
The B-pillar Datacard can be replaced, but the firewall, strut-tower, and engine block stamps are physically tied to the car. The guide how to check if a car is stolen by VIN covers the verification steps.
Decode any Mercedes 420 VIN free
Type your 17-character 420 VIN into the decoder at the top of this page for an instant breakdown. For related reading:
- Mercedes-Benz VIN decoder hub for the brand-wide guide
- How to read a VIN number for the general standard
- What every character in a VIN means for a position-by-position reference
- VIN decoder vs. vehicle history report for what a decode covers vs. what it doesn’t
