Classic Car

Mercedes-Benz (1976–1985)

Mercedes-Benz W123. Available as sedan, coupe, estate, and long-wheelbase. Legendary for durability.

15
Known Faults
13
Solved
5
Variants
0
Repair Guides

🚗 Variants

All production variants of the


🔧 Known Faults (15)

Community-reported faults with verified fixes


🔩
W123 240D glow plug failure
🟢 Solved · Beginner · 💰 $5–$40 GBP
93%
48 fixes
🔩
W123 engine oil leak from camshaft cover gasket
🟢 Solved · Beginner · 💰 $10–$40 GBP
91%
35 fixes
🔩
W123 200D OM615 glow plug failure — hard cold start
🟢 Solved · Easy · 💰 $40–$130 USD
86%
34 fixes
🔩
W123 rust in sills and floor
⚪ Unsolved · Advanced · 💰 $200–$1500 GBP
70%
31 fixes
🔩
W123 valve clearance adjustment — tappet noise
🟢 Solved · Moderate · 💰 Up to $60 USD
89%
31 fixes
🔩
W123 sunroof drain channels blocked — water ingress
🟢 Solved · Beginner · 💰 Up to $20 USD
94%
27 fixes
🔩
W123 automatic transmission kickdown cable adjustment
🟢 Solved · Beginner · 💰 Up to $30 GBP
83%
26 fixes
🔩
W123 rear spring helper rubber collapse
🟢 Solved · Easy · 💰 $20–$80 GBP
85%
24 fixes
🛢️
W123 200 M115 carburettor float level fault
🟢 Solved · Easy · 💰 $15–$60 GBP
87%
23 fixes
🛢️
W123 OM617 diesel injection pump timing drift
🟡 Partial · Advanced · 💰 $50–$180 USD
72%
22 fixes
🔩
W123 300D OM617 injection pump timing drift
🟢 Solved · Moderate · 💰 Up to $150 GBP
78%
22 fixes
🔩
W123 rear axle half shaft oil seal failure
🟢 Solved · Easy · 💰 $30–$100 GBP
85%
21 fixes
🔩
W123 steering box play
🟢 Solved · Easy · 💰 Up to $400 GBP
74%
20 fixes
🔩
W123 K-Jetronic warm-up regulator failure
🟢 Solved · Easy · 💰 $40–$150 GBP
80%
18 fixes
🔩
W123 rear axle differential oil low — bearing whine
🟢 Solved · Beginner · 💰 $15–$50 USD
91%
14 fixes

🩺 Common Symptoms

Symptoms reported across all fault cases


📋 Mercedes-Benz Overview & Buying Guide


Mercedes-Benz W123. Available as sedan, coupe, estate, and long-wheelbase. Legendary for durability.

Which variant to buy?

The was produced in 5 main variants. The most powerful option is the 230E (M102) with 136 hp (M102.982 engine). When buying, always verify the engine code matches the claimed variant — swapped engines are common on classic cars of this era.

What to check before buying

Based on 15 reported fault cases, the most important pre-purchase checks for the are:

  • W123 240D glow plug failure ✅ Known fix available
  • W123 engine oil leak from camshaft cover gasket ✅ Known fix available
  • W123 200D OM615 glow plug failure — hard cold start ✅ Known fix available
  • W123 rust in sills and floor
  • W123 valve clearance adjustment — tappet noise ✅ Known fix available

Is the reliable?

Of the 15 fault cases recorded for the Mercedes-Benz on MyCarFault, 87% have a verified fix. Regular maintenance, correct service intervals and addressing known weak points early significantly extends the life of these vehicles.

Own a Mercedes-Benz ?

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