All the VAG 1.9 litre TDi engines were PD (pump duse, with an umlaut over the 'u').
I think you are getting mixed up with the 2005-2007 ish 2.0 TDi PD engines which suffered from injector problems.
As the elec doctor says, the 1.9 engines are regarded as reliable, but pretty unrefined by today's standards.
Over time, the 90 was uprated to 100 BHP, the 110 to 115 BHP, and the 150 BHP introduced.
The best one IMO was the readily available 130 BHP, although all the TDi PD engines had narrow power bands (i.e. turbo comes in suddenly at around 1800 RPM and suddenly tails off around 3500)
I would avoid the 150 BHP, it was probably a stretch too far for the mechanicals and was even rougher than the lower powered engines.
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