2020 TOYOTA TUNDRA

Typical onset: 80,000-150,000 mi

Symptoms: Sudden metallic knocking or rod knock at idle, Low oil pressure warning light at operating temperature, Metal shavings in oil filter during changes, Catastrophic bearing failure with no prior warning in some cases

Fix: The plastic oil gallery plugs in the cam towers can pop out or leak, starving rod and main bearings of oil. Requires full engine teardown to replace bearings, plugs, and any damaged components. 35-50 labor hours for short block or full rebuild depending on damage extent. Some shops now recommend preventive plug replacement and upgrade to metal plugs around 100k mi (6-8 hours).

Estimated cost: $8,000-15,000

Typical onset: 60,000-100,000 mi

Symptoms: P0410 or P0418 codes (secondary air system malfunction), Rough cold start or extended cranking when cold, Hissing noise from engine bay on cold starts, Check engine light on startup that may clear after warmup

Fix: One-way check valves crack or stick, and rubber hoses become brittle. Common on trucks in northern climates with thermal cycling. Valve and hose replacement takes 2-3 hours. Not safety-critical but will trigger CEL and emissions test failure.

Estimated cost: $400-700

Typical onset: 70,000-120,000 mi

Symptoms: ATF puddle under front of truck near radiator, Low transmission fluid level on dipstick, Harsh or delayed shifts if fluid level drops significantly, Visible rust perforation on steel cooler lines

Fix: Steel cooler lines rust through where they mount to frame, especially in salt-belt states. Requires replacement of both lines and flushing trans fluid. 3-4 hours labor. Toyota issued TSB but no recall. Catching it early prevents transmission damage from low fluid.

Estimated cost: $600-1,000

Typical onset: 80,000-140,000 mi

Symptoms: Power steering fluid drips or puddles on ground, Whining noise from PS pump, worse when turning, Heavy steering effort, especially at low speeds or parking, Low fluid level in reservoir requiring frequent top-offs

Fix: High-pressure hose and hard lines crack at fittings or develop pinhole leaks. Related to NHTSA recall component pattern. Hose replacement is 1.5-2 hours; if hard lines are corroded, add another hour. Flush and bleed system afterward. Ignoring it kills the pump ($800+ additional).

Estimated cost: $450-900

Symptoms: No-start condition with cranking but no fuel pressure, Engine stalling at highway speed without warning, Rough running or hesitation under load, Fuel pump prime cycle noise absent when key is turned on

Fix: Low-pressure fuel pump (in-tank) can fail due to impeller manufacturing defect covered under NHTSA recall. Dealer replacement is free if VIN is in recall population. If not covered, pump replacement is 2-3 hours labor. Safety issue due to potential for stalling in traffic.

Estimated cost: $800-1,200

Symptoms: Water droplets visible inside headlight lens, Foggy or milky appearance after rain or car wash, Intermittent bulb failure from moisture corrosion, Reduced light output at night

Fix: Headlight vent seals fail, allowing moisture intrusion. TSB and partial recall coverage exists. Dealer may reseal under warranty extension, otherwise replacement headlight assemblies run 1-1.5 hours each side. Aftermarket sealing attempts rarely hold long-term.

Estimated cost: $400-800