Mercedes‑Benz DTC 1208 indicates excessive camshaft timing adjustment on the right cylinder bank—often logged as “constant adjustment of intake camshaft of right cylinder bank in direction Retarded” (similar to generic P0016).
Possible causes
• Worn timing chain or balance‐shaft drive gears on V6 engines (M272/M273), where gear tooth wear exceeds the VVT system’s compensation range
• Faulty camshaft variable timing actuator or clogged control valve solenoid, preventing proper cam phasing
• Poor oil quality or extended service intervals leading to contaminated oil and insufficient hydraulic pressure for VVT
• Failing camshaft position sensor giving erratic or missing signals, causing the ECU to see a timing deviation beyond limits
Symptoms
• Check Engine Light illuminated, often with DTC 1208 (and sometimes DTC 1200 for the left bank)
• Rough or unstable idle, occasional misfire
• Hesitation or lack of power under acceleration
• Unusual exhaust noise or occasional misfires
Diagnostic approach
• Read live data for cam/crank angle deviation to confirm timing drift beyond specification
• Check oil level and condition; replace with manufacturer’s recommended grade (e.g. Mobil 1 0W‑40) and shorten change interval
• Remove and bench‑test the VVT control valve (OCV) for smooth operation and inspect for metal debris or varnish
• Inspect timing chain and balance‑shaft gears for wear; high‑mileage engines often require teardown to assess component condition
Repair recommendations
• Replace the camshaft VVT actuator (including control solenoid) if faulty
• If chain or gear wear is severe, install a full balance‑shaft repair kit and reset timing
• Clean or replace oil filter and related passages to restore proper oil pressure
• Clear codes and perform a road test to verify cam timing adapts correctly
Preventive maintenance
Use OEM‑approved engine oil, adhere to shorter service intervals (no more than 7,500 km), and for high‑mileage V6 engines consider proactively replacing the balance‑shaft repair kit to avoid expensive teardo
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