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Hi there I am Brandon I am a mechanical n electrical engineering technical technician and 4 generation mechanic I am the man that regular mechanics call when they cant find out the problem the pro... don't have any thing do with the ecu you have a throttle plate sticking and it is been left open that is making it act up
if u have an electronic key than security codes from ur key must be programmed into the ecu to match-- most ecu change overs on cars usually require a trip to the dealer so they can install their programming most auto shops dont have the funds to, or customer base to spend thousands [every auto maker has their own software and update and change every year]-- every year on reprogramming software for ecu-- they may do only 1 or 2 a year
Location of the sensor: - in early cars is in the ECU, with vacuum pipe going from intake maniforld duct to the ECU - later models on the air intake duct, with wiring going to the ECU.
The fault may often be caused by:
- air leaks in MAP sensor line to the ECU (early ones only) or any of the vacuum control line hoses. This normally due to perished/loose flexi pipes, etc). - leaks in the air hoses going between turbo/engine/intercooler. Can be spotted by slight oil contamination at the point of leak.
Or it's variable vaine sticking (even intermittently) in the turbo due to contamination, preventing the turbo from performing according to the ECU demand, and hence being 'shut-off' by th ECU
So - check all vacum line for leaks, ensure turbo actuator is free to move, all air hoses are intact and secure, intercooler not leaking.
I don't wish to worry you but I think the turbo kicks in at around 2500rpm and it sounds like it isn't doing so, hence the management light coming on. It could be that failing. Be careful here, apparently the turbo uses the engine oil to maintain its operating temperature and if the turbo seals fail in anyway it eats the engine oil, with the resulting total failure of the power unit. So if you do nothing else, keep an eye on the engine oil level. (You may also notice oil smoke out the exhaust as well).
Unfortunately it looks like a trip to the dealer for them to check what the engine management is saying.
Don't know much about VW but if it's fine, and it doesn't happen again I wouldn't worry about it. If it does try resetting the ECU by removing the battery terminals and touching the positive lead(red wire) to the negative battery post. It might spark a little, this is just the capacitors discharging, resetting your ECU and starting over. It's like restarting your personal computer
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