Jaguar 2000 xjr: While driving vehicle would suddenly display warning message that traction control / asc was not available and would go into a failsafe engine mode. Engine would then run very roughly and would not accelerate past 5-10mph. Mechanic diagnosed a fault code of P0121 which is addressed as a known Jaguar technical service bulletin for a "mismatched" connector to the throttle body. Internet research reveals that this is a very common problem experienced by many Jaguar owners that is known by Jaguar and constitutes a safety hazard. Jaguar knows that it mismatched gold and tin plated throttle body connectors and advised its repair tech's to replace only if customer complains! how will a customer know such a problem exists until it happens and it will happen eventually. Anything that may suddenly and without warning affect a vehicle's ability to accelerate is a major safety hazard. Jaguar should have and must issue a full recall of the affected vehicles before somebody gets catastrophically injured and/or killed. It costs in excess of $450+ to fix this known problem and Jaguar is allowing consumers to drive unsafe vehicles that may fail at the worst time. What would have happened if I was making a left turn and it failed at the wrong time and got broadsided with my wife or children inside?

- Van Nuys, CA, USA