Some years ago I owned a 2001 C5 2.2HDi SX with 136 BHP and the 5 speed gearbox.
I would advise against the 2.2 engine, it was seriously complicated with a multitude of pressure sensors, plus a small tank of diesel additive which used to squirt into the main fuel tank every third or fourth fill-up.
The car often went into limp mode, with an array of warning lights coming on.
The model you want with the 6 speed gearbox is the facelifted version from 2005 onwards. This had a 2.0 HDi engine with 138 BHP and was available in VTR+ and Exclusive trim.
This revised engine was more reliable, didn't have the stupid diesel additive tank or as many sensors. It was also slightly more economical with an EC combined figure of (IIRC) 47.9 MPG.
There was also a 173 BHP version of the 2.2 HDi at around this time, also to be avoided.
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