SOURCE: vw polo 1.4 classic idle problems
when you last time changed your labda sond also the sensors on fuel intake system can resolve that
in most cases is lambda sonda problem
SOURCE: volkswagen polo classic 1998
85-92 VW golf/jetta Haynes Manual
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SOURCE: Hi, I just purchased a VW Polo 1.6 Classic 2004
Please re-check the fuel system to ensure that there are no blockages anywhere.
Good luck.
SOURCE: Overheating Polo
this sounds like a thermostat fault, but also could be the sensor switch to the radiator but is more likely the thermostat, it should be located at the front top of engine, follow the top water hose to the engine and you will find the thermostat housing, also just a heads up, these had a problem when first made, according to the known fixes and problems with VW's the hoses corroded inside and started loosing water, this could be wise to get the system presure checked to...hope this helps
SOURCE: My 1997 VW POLO CLASSIC has a new fuel pump
It is possible if there are codes in the ECU(computer)
which leads you to that conclusion.
And it's hard to tell you if your mechanic right or wrong without having the car for diagnostics.
There are many other causes for engine to loose power.
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