2017 TOYOTA SEQUOIA

Typical onset: 60,000-100,000 mi

Symptoms: Check engine light with P0410, P0418, or P0419 codes, Rough cold starts or extended cranking when cold, Rattling noise from engine bay on cold startup, Failed emissions testing

Fix: Replace air injection pump and often both check valves. Pump is behind the alternator requiring significant disassembly. 3-4 hours labor if just the pump, add another hour if valves are seized. This is an emissions system so not immediately catastrophic but will cause inspection failure.

Estimated cost: $800-1,400

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid in coolant (strawberry milkshake appearance), Coolant in transmission (delayed shifts, slipping), Transmission overheating, Pink residue in coolant overflow tank

Fix: The internal cooler in the radiator can fail, allowing cross-contamination. If caught early (fluid in coolant only), replace radiator and flush transmission: 4-5 hours. If coolant entered transmission, you need full transmission rebuild or replacement plus radiator. This is THE killer of Sequoia transmissions. Many techs now recommend external cooler bypassing the radiator entirely.

Estimated cost: $1,200-1,800 (early catch), $4,500-7,000 (transmission damaged)

Typical onset: 90,000-140,000 mi

Symptoms: Power steering fluid leaking onto subframe or driveway, Groaning or whining when turning at low speed, Stiff steering when cold, loosens up when warm, Low fluid level requiring frequent top-offs

Fix: Rack seals deteriorate, often at the input shaft. Some racks develop internal wear causing noise even without external leaks. There was a Toyota recall (LSC-10L) for 2007-2008 models but same rack used through 2017. Replacement requires 5-6 hours labor due to size and weight of this truck. Alignment required after. Some shops attempt seal replacement but rack replacement more reliable long-term.

Estimated cost: $1,400-2,200

Typical onset: 100,000-150,000 mi

Symptoms: Ticking or tapping noise on cold start, lessens when warm, Exhaust smell in cabin, Visible soot around manifold-to-head junction, Rarely: check engine light with bank 1 or bank 2 lean codes

Fix: Exhaust manifold studs break or back out due to heat cycling. More common on driver's side. Requires manifold removal, stud extraction, and retapping threads. 4-5 hours per side. If studs break flush with head, add 2 hours for extraction. Some techs use aftermarket upgraded studs to prevent recurrence.

Estimated cost: $800-1,500 per side

Typical onset: 120,000+ mi

Symptoms: Brake pedal slowly sinks to floor when held at stop, Firm pedal on first press, soft on subsequent presses, No visible external fluid leaks, Brake fluid level drops slowly over weeks

Fix: Internal seals in master cylinder bypass fluid under sustained pressure. This is dangerous because it presents as 'soft brakes' without obvious external leak. Bench bleed new master carefully on these due to ABS/VSC integration. 2-3 hours including bleed and ABS activation procedure. Always inspect brake booster pushrod adjustment.

Estimated cost: $600-900

Typical onset: 110,000-160,000 mi

Symptoms: Oil seepage or drips from front of engine, Oil visible around harmonic balancer, Oily buildup on lower engine and skid plate, Burning oil smell after highway driving

Fix: Front timing cover gasket and front crankshaft seal leak on higher-mileage 5.7L engines. Timing chain itself is robust but accessing the cover requires removing accessories, radiator, and water pump. This is 8-10 hours labor. Many techs replace water pump, thermostat, and serpentine belt while in there since access is identical. Not urgent if leak is slow but will eventually coat everything in oil.

Estimated cost: $1,800-2,800