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I'm on my 2nd VX and my brother owns a VX and something I've noticed is that they do not like after market over sized exhaust, that for whatever reason it leads to an early 02 sensor death and on a VX that is a $200 to $350 part that keeps getting more expensive! keep a good stock exhaust on the car and your o2 sensor should last 200,000+ miles, over sized exhaust like I had for a while and the o2 sensor lasted around 10,000 miles! fixed the exhaust and replaced the sensor and it's been going strong for around 80,000 miles in one car and 40,000 in my other, when someone says they were shocked that an o2 sensor was going to cost them $350 from the parts store they are shocked when I ask them if they have a loud exhaust, I've also seen a 2-3mpg increase in mileage switching to stock exhaust.
If your shift light is not working it might be from being heavy on the gas pedal, pushing on the gas tends to push it out of the peramitors that tell the shift light to turn on.
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