update:
Got bored today. so removed petrol cap and this time completely removed rubber gasket and cleaned crap from behind it, cleaned gasket, appled vasoline to back and replaced gasket, then applied vasoline to face side and put cap back on. Didn't bother removing any battery terminals.
Anyways made the short journey to asda for some fine Malbec, the lights still showing.....then after the shop started up and NO LIGHTS!!!
Will see if this continues......if it does the question is this....
Yesterday what would a diagnostic machine plugged in have found? sensor faulty maybe?.........and now with no lights on what would the diagnostic machine find?..............which then leads to the question....have I been raped by my Lexus dealer in the past?
Happy New year to everyone...and good luck.....I think we all will need it.