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it seems obvious, but has the throttle body been changed yet? 9 out of 10 times it's the throttle body. I've even had the same TB cause different faults on different cars
main ones are from the box to the body in the passenger wheel arch, and from the battery to the body next to the headlight. there's another from the ecu loom to the gearbox just above the passenger driveshaft
IMO the top cup that slides down the shaft is broken and needs replacing. There should be a step at the top of the shaft/bottom of the thread that it locates on. The slimline nuts should both be removable
Re: Block the small hole of return of oil in the decanter of oil : Good, Bad, Dangero
1 is for positive crankcase ventilation. This means the oil vapours are sucked into the engine through this hole. There is no issue from blocking this as long as the main outlet (number 2) is unrestricted
totally inconclusive test. I've seen one with a dead lambda (and I mean DEAD, no signal at all) still give ~40mpg. The car didn't drive well though
Plug in and look at live data and long term trims is the only way to tell if it's working properly. And no a code reader off ebay isn't good enough...
all that pipe does is take air from the accoustic valve to make induction noise less. you're still filtering with it disconnecet and it's probably less resticted