The 2013 E63 AMG with the M157 5.5L BiTurbo is a high-performance sedan with serious head bolt failure issues that can lead to catastrophic engine damage. When maintained properly and caught early, it's thrilling, but the engine reliability shadow looms large over ownership.
M157 Head Bolt Failure / Head Gasket Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Rough idle or misfires, Coolant in oil (milky dipstick), Overheating under load
Fix: The M157 has a known defect where head bolts stretch and lose torque, causing head gasket failure and sometimes cracking the cylinder head itself. Repair requires heads-off, new OEM head bolts (aftermarket studs recommended by many), gaskets, and often head resurfacing. If caught late, coolant intrusion destroys bearings. 18-25 labor hours for proper job with machine work.
Estimated cost: $6,500-12,000
Piston Ring Land Failure / Bore Scoring
Occasional · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Excessive oil consumption (quart every 500-1000 miles), Blue smoke on deceleration or startup, Loss of compression in one or more cylinders, Metallic rattling from engine
Fix: Direct injection and high boost stress the piston ring lands on the M157. Rings break, scoring the cylinder walls. Once oil consumption starts climbing, it's typically terminal. Requires complete engine disassembly, bore honing or re-sleeving, new pistons and rings. Some shops recommend short block replacement. 35-50 hours depending on approach.
Estimated cost: $12,000-22,000
7-Speed MCT Transmission Oil Cooler Leaks
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Transmission fluid pooling under vehicle, Burnt transmission fluid smell, Harsh or delayed shifts when cold, Transmission overheating warning on dash
Fix: The oil cooler lines and the cooler itself develop leaks at the crimped connections and internal seals. Leaked fluid contaminates coolant system if internal leak occurs. Replace cooler and associated lines as assembly. 4-6 hours labor. Must flush coolant system if cross-contamination occurred.
Estimated cost: $1,200-2,200
Transmission Mounts Deterioration
Common · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration at idle in gear, Excessive driveline movement felt during acceleration
Fix: The MCT transmission mounts fail from the constant torque cycling of the high-output engine. Rubber separates from metal, causing harsh engagement and clunking. Replace all transmission mounts (typically 2-3 depending on configuration). 2-3 hours labor.
Estimated cost: $600-1,100
Turbocharger Wastegate Rattle and Failure
Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Rattling sound from engine bay on cold start (goes away when warm), Reduced boost pressure / limp mode, Check engine light with underboost codes (P0299, P003A), Turbo whistle or abnormal spool sounds
Fix: Wastegate actuator arms wear and rattle, sometimes the wastegate flapper itself fails or sticks. Can lead to overboosting or chronic underboost. Turbo replacement is typical fix; some specialty shops can rebuild. 8-12 hours per turbo depending on which side and if manifolds need removal.
Estimated cost: $3,500-6,500
Fuel Injector Carbon Buildup and Failure
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough idle or misfires on specific cylinders, Poor cold start performance, Loss of power under acceleration, Check engine light with misfire codes
Fix: Direct injection means no fuel washing intake valves, and injectors themselves clog or fail electrically. Walnut blasting intake valves and replacing failed injectors usually solves it. Injectors are expensive MB parts. 6-9 hours for valve cleaning and injector replacement depending on how many need replacing.
Estimated cost: $2,000-4,000
Owner tips
Check for head bolt TSB history and insist on leak-down and compression tests before purchase—head bolt failure is the Achilles heel of this engine.
Change transmission fluid every 40,000 miles despite Mercedes 'lifetime fill' claim; heat kills the MCT.
Use Top Tier fuel exclusively and add occasional fuel system cleaner to help combat direct injection carbon issues.
Budget $2,000-3,000/year for maintenance beyond consumables—this is a six-figure supercar drivetrain in a sedan body.
Walnut blast the intake valves every 50,000-60,000 miles preventatively to avoid misfires and maintain power.
Buy only if the head bolts have already been addressed with upgraded hardware and you have a $5,000-10,000 engine-failure emergency fund; otherwise the M157 is a ticking time bomb that can grenade your wallet.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located in trunk; high performance system demands AGM for M157 BiTurbo engine
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Every control module on the 2012-2013 Mercedes-Benz E63 AMG — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Requires subscription activation after replacement.
Intelligent Light System Control Unit (ILS)0.6 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Behind each headlight assembly (left and right)
🔧 Xentry or Autel
⚠️ Adaptive headlight system. Leveling calibration required. Two modules (left/right).
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2013 Mercedes-Benz E63 AMG 5.5L V8 BiTurbo M157 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.