Peugeot VTi (badge, not an engine)

VTi is a badge, not an engine — PSA's word for a naturally aspirated petrol, on Peugeot, Citroën and DS in this catalogue.

⚑ Its turbocharged counterpart is THP, and on the 1.6 the two are the same engine family. The Peugeot 308 was sold with a 1.6 EP6 VTi and a 1.6 EP6DT THP in the same brochure — one block, one badge apart, with a turbocharger between them. A boost diagnosis on a VTi is work on a part that is not fitted, and a fault-code list read from a THP of the same size names circuits this car has never had.

Which engine depends on the displacement and the year:

• 1.6 — EP6, the BMW–PSA Prince family, which has its own page here.
• 1.4 — EP3, the Prince's smaller relative, and the older TU3JP.
• 1.6 — TU5 / TU5JP4 on the earlier cars, and EC5 on the Chinese-built ones. Three unrelated families under one badge at one displacement.

⚑ VTi also belongs to another marque entirely. MG writes VTi-Tech on its N-series 13S4C and 15S4C, which share nothing with PSA's engines but the three letters. A search for "1.5 VTi" finds an MG; a search for "1.6 VTi" finds a Peugeot, and no part crosses between them.

⚑ The Prince engine's timing chain is the thing to know about the 1.6. A 2013 service bulletin covers failing chains and tensioners, both designed by BMW, and it applies to the naturally aspirated engine as much as the turbocharged one.

Establish the family code, on the engine and in the build sheet.