The 7M-GTE's KVAFM isn't a "wear component" per se but they use a very sensitive optical sensor and are VERY delicate. There are a number of factors which contribute to their demise including improper handling and/or servicing and fogging of the optics.
The 7M-GE's VAFM IS a "wear component" and should be replaced about as often as the TPS which uses the same type of internal mechanisms to generate it's signal. How often these components may need to be replaced will depend on how the vehicle is driven and how varied the operating conditions are. From what I've seen personally they're almost always out of spec by the time the timing belt is changed. The TPS on the GTE isn't an exception to this.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.
If you're so inclined I'm always more than happy to accept tips via PayPal. 
Tip Jar ---> 
|