OEM 2004 Toyota Prius Knock Sensor

2004 Toyota Prius Knock Sensor Parts Q&A

• Q: How to replace the Knock Sensor on 2004 Toyota Prius?

  A: Starting the Knock Sensor replacement requires removal of three components which are radiator support opening cover, engine under cover LH, and draining the engine coolant. Next, remove rear floor board No. 2, deck floor box rear, and rear floor board No. 3. The engine wire number 3 and driver side battery terminal need disconnecting before removing the air cleaner assembly together with the oil level gauge guide which requires removal of its gauge and wire harness clamp and bolt. Use T10 torx bits to disconnect hoses while removing wire harness clamps throughout the process until the intake manifold along with its gasket can be removed from the cylinder head. The knock sensor requires connector disconnect and nut removal before extracting it from its position. Attach the new knock sensor while installing the appropriate nut before securely putting back the knock sensor connector. Place the intake manifold on the engine block using a fresh gasket then fasten three bolts and two nuts followed by connecting all previously separated hoses and connectors. Install the oil level gauge guide using new engine oil on an unbroken O-ring and tighten it with the bolt. Place the oil level gauge and air cleaner assembly on their positions before reconnecting engine wire No. 3. After engine coolant addition check for any leakages in both engine coolant and engine oil systems. Rephrase this instruction by justifying the sequence of installation that ends with power window control initialization.