MarkH

chip sellers are preying on our uneasiness regarding warranty service. If I don't need to buy an extra I really don't want to spend the extra couple hundred. I've also not heard one case of refused service on the forum, so why is everybody making sure they have an OEM ECU available for service? Are we wasting our money?

Kevan

Paranoia for me =)

RickM

From everything I've read, there isn't much danger of a dealer refusing to do routine scheduled service simply because he knows the car's been chipped. But that isn't the issue. The problem will arise, if at all, when something non-routine has gone wrong with the engine and the car is still under warranty. In that situation the dealer may (rightly or wrongly) attempt to avoid doing the work for free under warranty by attributing the problem to the chip. Since you don't want to tip off the dealer to such a possible "defense" should that situation ever arise, you want to have a spare ECU in order to swap the original back in whenever the car is taken in for service. That's the thinking behind having a spare ECU; if you don't want to give your dealer ammunition to fight a warranty claim, swap the ECU before each service visit.

Rick