vvt-i solenoid and the vvt-i position sensor.

[Abe Scott]

    I have seen tutorials for changing the VVT solenoid, but no one has ever mentioned the VVT position sensor. Does it ever go bad? If so, how difficult is it to replace? 

[RX400h]

18 hours ago, Abe Scott said:

    I have seen tutorials for changing the VVT solenoid, but no one has ever mentioned the VVT position sensor. Does it ever go bad? If so, how difficult is it to replace? 

Quote

The Variable Valve Timing (VVT) system in your 1999 Lexus LS400 includes components such as the VVT solenoid, also known as the Oil Control Valve (OCV), and the camshaft position sensor. While the VVT solenoid is often discussed in DIY tutorials, the camshaft position sensor is less frequently mentioned. However, it can fail and cause your vehicle to crank without starting or die intermittently¹.

As for the difficulty of replacement, it can vary. The process typically involves unplugging the connector from the sensor and removing it from its location on the engine. However, the exact steps can depend on the specific location and design of the sensor in your vehicle. If you’re not comfortable doing this yourself, it may be best to have a professional handle it.

As for the VVT system malfunctioning, it could be due to various factors. It could be narrowed down to three possible components: the Engine Control Module (ECM), the Oil Control Valve (OCV), or the VVT Controller. Cleaning the oil control valves has been reported to solve the issue in some cases

 

[Abe Scott]

Thanks for your input. I had no idea that there was a VVT position sensor. I found it in an exploded view while searching for something else.