Grateful to both of u, Martin and Roy. Last time i didn't see the replced cap as it was replced by Audi workshop. I only saw the removed one.I was about to buy a new one but u saved me from this.I also removed spark plugs and checked the wires and found all good.As i mentioned before that i checked idle stabilisation valve, Throttle position sensor and air flow meter and found all good. My G4 also good as its reading is 0.99 ohm but reading of G28 is 0.96 ohm which should be similar as G4.what do u suggest should i replace G28 sensor (engine speed sensor)? Next quiry would be how to change. I tried and loosened the upper bolt of shield but no space of tool for lower bolt as the exhust pipe is very close. kindly guide.Many thanks.
