My 2003 NB kicked on a check engine light when I plugged the EGR line and when I used the VCDS adaptation method, my MPG dropped by 3mpg...I put everything back to stock.
I'll be honest my ALH Timing belt failed at the tensioner....previous owner had it installed at a shop that didn't understand how it was supposed to be properly eh....tensioned. Good look see of the components will help you decide if you trust the work.
I was always glad that my 03 NB GL came without a TDI badge to keep the thieves away but then again the manual transmission should be enough of a deterant now days...will be following.
I adjusted my 03 NB to cycle the EGR less often and my MPG took a dump of 3 to 4 MPG over the same roads for a couple of tank fulls....changed it back to factory setting.
For information purposes, my 2003 Alh beetle 5 spd's blue coolant light goes off at 138 degrees F according to coolant temp info from my obd2 Ultra Guage unit
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