I have a motorhome from 96 that only done 20 000 km (12 000 miles). Only driven it 4 000 km myself since bought it last autumn. It suddenly start loosing power, estimate around 20% less. But that is much on a heavy motorhome. I replaces air and fuel filters, lift pump is working well. There is no smoke from exhaust. I got codes P0236 and P0237 suggesting a turbo/wastegate problem. But there is no black smoke or other sympthoms that should show if I have low pressure. Turbo is fine, wastegate seem to work. Still have to get a way to measure the pressure to confirm that. Don't think it's a blocked exhaust system.

Any thoughts?

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P-O