2007 MERCEDES-BENZ E55 AMG

Typical onset: 80,000-150,000 mi

Symptoms: Strawberry milkshake appearance in coolant reservoir or transmission fluid, Transmission slipping or harsh shifts after warmup, Overheating transmission or coolant system, Check engine light with transmission temp codes

Fix: The internal transmission cooler in the radiator fails, mixing ATF and coolant. Requires immediate shutdown to prevent total transmission death. Fix involves new radiator, complete transmission fluid flush (often multiple exchanges), new transmission filter/conductor plate. If caught late, full transmission rebuild/replacement required. 8-12 hours labor for preventive radiator replacement and thorough flush; add 20-30 hours if transmission needs rebuild.

Estimated cost: $1,800-3,500 preventive; $8,000-12,000 if transmission damaged

Typical onset: 60,000-120,000 mi

Symptoms: Red 'STOP Vehicle - See Owner's Manual' warning, Brake warning light with audible chime, Hard brake pedal or reduced brake assist, ABS/ESP lights illuminated simultaneously

Fix: The electro-hydraulic brake system pump (SBC unit) has a finite lifespan tracked by internal counter. Mercedes issued recalls/service campaigns but many 2007s are past that. Replacement is SBC unit swap (remanufactured units available). Not a DIY job—requires dealer-level scan tool for initialization. 3-5 hours labor.

Estimated cost: $2,500-4,000

Typical onset: 70,000-130,000 mi

Symptoms: Vehicle sagging at one or more corners, especially overnight, Suspension warning light 'Airmatic Visit Workshop', Compressor running constantly or not at all, Harsh ride or bottoming out over bumps

Fix: Air struts develop leaks in bellows or seals; compressor wears out from overwork. Front struts more common than rears. Each strut is 2-3 hours labor; compressor is 2 hours. Many owners convert to Arnott coilover conversion kit (~$1,500 parts + 4 hours labor) to eliminate future issues. OEM air strut replacement per corner: 2.5 hours.

Estimated cost: $800-1,500 per strut; $1,200-1,800 compressor; $2,200-3,000 coilover conversion

Typical onset: 100,000-180,000 mi

Symptoms: Intermittent misfires or rough idle, Random check engine lights (multiple cylinder misfire codes), Hard starting or no-start conditions, Crankshaft/camshaft position sensor codes that return after replacement

Fix: M113K uses biodegradable insulation on engine harness that breaks down with heat cycles. Wires short or break, causing ghost codes. Full harness replacement requires engine removal for proper access (front subframe drop method possible but difficult). 18-25 hours labor depending on approach. Aftermarket harnesses available but quality varies.

Estimated cost: $3,500-6,500

Typical onset: 90,000-150,000 mi

Symptoms: Harsh 2-3 or 3-4 shifts, Delayed engagement into Drive or Reverse, Limp mode (transmission stuck in gear), P0715, P0700, or solenoid-related codes

Fix: The 722.6 transmission's conductor plate (internal wiring harness) and valve body solenoids fail from heat and wear. Often accompanies or precedes oil cooler failure. Requires pan drop, new conductor plate, 13-pin connector, speed sensors, and fluid/filter. Valve body replacement if solenoids are damaged. 6-9 hours labor.

Estimated cost: $1,800-3,200

Typical onset: 80,000-140,000 mi

Symptoms: Reduced power under boost, Higher-than-normal intake air temps, No coolant circulation noise from intercooler system, Check engine light with charge air temp codes

Fix: The dedicated intercooler coolant pump (separate from main cooling system) fails. Causes heat soak and power loss but won't strand you. Pump replacement is straightforward—front of engine, accessible. 2-3 hours labor. Also check intercooler radiator for leaks while in there.

Estimated cost: $600-1,000

Typical onset: 70,000-120,000 mi

Symptoms: Intermittent no-start or crank-no-start, Rough idle with timing-related codes, Rattling noise from front of engine on cold start, P0340, P0345, P0016, P0017 codes

Fix: Crank sensor fails (common Mercedes issue); camshaft adjusters (VVT gears) wear and rattle. Crank sensor is 1 hour; cam adjusters require valve cover removal, timing chain work. 8-12 hours for both cam adjusters plus chain/guides if worn. Often done during other front-end work.

Estimated cost: $150-300 crank sensor; $2,500-4,000 cam adjusters with chain service