2018 TOYOTA TUNDRA

Typical onset: 40,000-90,000 mi

Symptoms: Sudden loud ticking or knocking from valve train, Metal shavings in oil, Check engine light with camshaft position codes, Catastrophic engine failure if driven after symptoms appear

Fix: Complete engine rebuild or replacement. Cam tower cracks allow oil starvation to cam bearings, destroying camshafts, rockers, and often spreading debris through the entire engine. Requires cylinder head removal minimum (18-25 hrs), but contaminated oil usually means full short block replacement (35-45 hrs). Toyota extended warranty to 10yr/150k on some VINs but not all 2018s are covered.

Estimated cost: $8,000-15,000

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid leak near radiator or frame rail, Pink fluid puddles under truck, Low transmission fluid warning or delayed shifts, Visible corrosion on steel cooler lines at bends

Fix: Replace corroded cooler lines from transmission to radiator. Lines run along frame and rot from road salt and stone impacts. 3-5 hrs labor. If leak goes unnoticed and transmission runs low, you're looking at internal damage and rebuild.

Estimated cost: $400-800

Typical onset: 60,000-120,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Driveline shudder on acceleration, Visible tearing or separation of rubber mount

Fix: Replace rear transmission crossmember mount. The rubber isolator tears from torque cycling, especially on trucks that tow. 1.5-2.5 hrs labor. Often done with a full transmission service while you're under there.

Estimated cost: $250-450

Typical onset: 100,000-160,000 mi

Symptoms: Check engine light with P0410 or P0418 codes, Loud buzzing or grinding noise on cold start for 60-90 seconds, Emissions test failure in states that monitor readiness, No driveability impact

Fix: Replace secondary air injection pump and check valve assembly. Pump seizes from corrosion or check valve fails allowing exhaust gas backflow. 2-3 hrs labor. Truck runs fine without it but won't pass emissions in some states.

Estimated cost: $800-1,200

Typical onset: 90,000-180,000 mi

Symptoms: Loud ticking or exhaust leak sound from engine bay on cold start, Smell of exhaust in cabin, Visible soot streaks on manifold, Sound diminishes as engine warms up

Fix: Extract broken manifold studs and replace. Studs corrode and snap from heat cycling. Extraction on the 5.7L is straightforward if caught early (4-6 hrs per side), nightmare if studs break flush and require head removal (12-18 hrs per side). Address at first sign of leak before studs seize completely.

Estimated cost: $600-1,200 if caught early, $2,500-4,000 if head removal needed

Typical onset: 70,000-130,000 mi

Symptoms: Hard brake pedal requiring excessive effort, Hissing sound from under dash when braking, Engine stalling when coming to a stop, Vacuum leak codes or rough idle

Fix: Replace brake booster check valve or entire booster assembly. Check valve fails and loses vacuum assist. Valve alone is 0.5 hrs, full booster is 2-3 hrs if internal diaphragm is compromised.

Estimated cost: $80-200 valve only, $600-900 full booster