Hello. My Polo classic 1.6 2007 model was diagnosed and it was found that crank sensor was a problem. I bought the new one from Volkswagen and it was replaced. The car "sometimes" does not start. It react like before when the sensor was not replaced. What should I do?

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

Kevin Blair

• 196 Answers
• Posted on Feb 12, 2009

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.

steve morris

• 1675 Answers
• Posted on Feb 08, 2010

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.