The Jaguar XJ12 Series 1 model established the XJ21 ... its complex design made it extremely unreliable when it was modified to meet the increasingly stringent emissions standards.

Our quest left us in awe of this heavily modified Jaguar ... The base was to be Jaguar's flagship luxury saloon, an XJ12. It was no slouch to begin with, packing a 310 horsepower, 6.0-liter ...

The AJ 4 used a Jaguar XJ12 as a base before fettling it with ... Starting under the forward tilting bonnet, new AJ 4s will benefit from a modified version of the original 5.3-litre HE V12 engine.

Actual terms vary by lender. Base shown (base trim). Is the 1995 Jaguar XJ12 reliable? The 1995 Jaguar XJ12 has an average reliability rating of 5 out of 5 according to Cars.com consumers.

Actual terms vary by lender. Base shown (base trim). Is the 1994 Jaguar XJ12 reliable? The 1994 Jaguar XJ12 has an average reliability rating of 4 out of 5 according to Cars.com consumers.