PCV Breather Hose 1HZ Toyota LandCruiser HZJ75 HZJ78 HZJ79 HZJ80 HZJ105 & Coaster (Vent Hose)

PCV breather hose to suit Toyota 1HZ diesel engines used in LandCruiser and Coaster models.

Connects the rocker cover to the intake system to maintain proper crankcase ventilation and prevent pressure build-up.

Common cause of oil leaks and crankcase pressure issues on 1HZ engines.

This hose connects the rocker cover breather to the intake system as part of the PCV (crankcase ventilation) system.

Its job is to:

• Vent crankcase pressure
• Recirculate vapours into the intake
• Maintain correct engine breathing

Over time these hoses:

• Go hard
• Crack
• Collapse internally

When that happens, you can get:

• Oil leaks from seals
• Increased crankcase pressure
• Oil mist in the engine bay
• Poor running or inconsistent performance

A failed breather hose is a common cause of oil leaks that are often misdiagnosed.

Vehicle Compatibility

• Toyota LandCruiser HZJ75
• Toyota LandCruiser HZJ78
• Toyota LandCruiser HZJ79
• Toyota LandCruiser HZJ80
• Toyota LandCruiser HZJ105
• Toyota Coaster (1HZ engine models)
• Engine: 1HZ 4.2L Diesel

Common Questions

Does this suit Coaster buses?

Yes — suits Coaster models fitted with the 1HZ engine.

What does this hose do?

Allows the engine to vent crankcase gases back into the intake.

What happens if it fails?

Can cause oil leaks, pressure build-up, and poor engine performance.

Is this a common issue?

Yes — very common on older 1HZ engines.