Does a 2011 Nissan Navara Turbo have a timing belt or chain warning light?

No. While the D40 Navara did have warning lights for things like contaminated diesel fuel and a warning light for the Diesel Particulate Filter (DPF) the Navara didn’t stretch to a light to warn that maintenance to the camshaft timing system was due. That’s mainly because the Navara’s four-cylinder turbo-diesel engine used a timing chain rather than a rubber timing belt, and the chain should have been good for the life of the engine.

Experience has shown, however, that the YD25 engines that used a single-row primary timing chain did, indeed, experience premature chain wear and failure in some cases. And this is probably at the root of your question. The trade now recommends that these chains be changed before the 80,000km mark, with inspections every 40,000km to make sure nothing is wearing out too fast. The aftermarket has developed a double-row replacement timing chain for these engines, so any replacement of the chain should take this into account.