Genuine Toyota Highlander PCV Valve

Toyota Highlander PCV Valve Parts Questions & Answers

• Valve Sub-Assembly, Vent
  12204-0P020
  Q: How to replace the PCV valve on Toyota Highlander?

  A: On all models except 1AR-FE four-cylinder engines, the PCV valve is located in the valve cover. On 1AR-FE models, the PCV valve is mounted in the crankcase breather on the front side of the engine block. On 1AR-FE models, remove the intake manifold. On all models, disconnect the hose. On models with a rubber grommet, pull the PCV valve from the cover; on all other models unscrew the PCV valve from the cover or breather. On all models except 1AR-FE four­-cylinder engines, remove the valve from the hose. On all models, remove the valve, then blow through the valve from the valve cover or breather case end. With the engine idling at normal operating temperature, place your finger over the valve opening. If there's no vacuum at the valve, check for a plugged hose or valve. Replace any plugged or deteriorated hoses. Turn off the engine. If air will not pass through the valve in this direction, replace it with a new one. When purchasing a replacement PCV valve, make sure it's for your particular vehicle and engine size. Compare the old valve with the new one to make sure they're the same.
• Valve Sub-Assy, Ventilation
  12204-28020
  Q: What is the function of the Positive Crankcase Ventilation (PCV) system and when should you consider checking and replacing PCV Hose and PCV Valve on Toyota Highlander?

  A: The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by directing blow-by gases and crankcase vapors into the intake manifold. Fresh air from the air filter housing mixes with these gases in the crankcase before exiting through the PCV valve. During idle and part-throttle conditions, blow-by gases flow through the PCV valve into the intake manifold, while fresh air is drawn into the crankcase. Over time, sludge buildup may reduce the system's efficiency and cause leaks. Regular checks and possible replacements of the PCV valve and hoses during routine maintenance are recommended.