What car is this? We suddenly experienced something similar in a Mercedes Diesel Auto and found the Turbo pipe was smashed/leaking like a sieve, so car went OK on level ground when not under torque but was a puffing billy with smoke trying to get uphill or anything like top speed on the motorway. It it's an auto check the speed limiter hasn't been accidentally switched on.
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If the engine is idling fine, it could be the transmission itself.
Take it to a shop with a scan tool and they will be able to tell you what gear the transmission is actually in and what it thinks (computer thinks) is going on.
Sound like you are looseing some boost from your turbo,check all your hoses from your turbo,if all of them are ok you may have a waste gate sticking, you need to check for movement there it only move very little but has alot to do with hp.Thanks And I hope this helps you
Has the check engine light gone on? The focus is going into 'limp' mode to avoid damage to components, due to some problem. Even if there is no check engine light illuminated, bring it to a parts store for a free check of any codes stored in the cars computer. You need this info to figure out what is wrong. If after having the parts store scan for codes you still have questions, re-post them with the codes here.
think this a problem for dealer mechanic with product knowledge,because all lights coming on then loss of power sounds like it could be an ECU fault being triggered by a sensor,or just a component in the ECU breaking down .It would need the computer connecting then running till fault shows up .sorry i couldnt give an instant fix