Also known as: xud9, xud7, xud, 1.9 d, 1.9 td psa, 1.7 d, xud9a, xud9sd
PSA's indirect-injection diesel — 1.7 as the XUD7, 1.9 as the XUD9 — and one of the most widely borrowed engines of its era. Beyond the 306 and 405 it went into the Suzuki Vitara and Baleno and the Hyundai Lantra, so a fault documented on a Peugeot describes those cars exactly.
It is famously long-lived and famously slow, and the durability is what makes the rest matter: these engines routinely outlast the vehicles around them, so the question on any example is what has been done to the fuel system rather than how far it has gone.
Which injection pump it has decides most diagnoses. The Lucas/CAV pump is the weak one: it wears internally and sheds fine debris into the fuel, which then blocks injectors and can take the replacement pump with it. A rough-running XUD with a Lucas pump wants the whole fuel side cleaned rather than one part replaced. The Bosch pump is the more durable of the two and fails less dramatically when it does.
It is an interference design, so a snapped belt bends valves — and on an engine this old and this cheap, belt history is the thing most often unknown and least often assumed.
Cars fitted with this engine
6 generations, across 4 makes. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Posted about this engine
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about XUD (1.8 and 1.9).