well its all come baclk with a p01000 code, repeatedly- tried a maf cleaner but unconvinced and was right -ordered a replacement MAF sensor from autoparts Stornoway for £116- came in two days-great-turns out to be a genuine bosch part.
anyway to the point- I traced the wiring loom back to the y junction which is below where the MAF sits-and it disappears it the larger engine loom-no sign of a break- so removed the flexi coil protecting the wires and hey presto -broken and corroded sensor feed wire.
problem -only 1" of available wire from the main loom!
solution- I cut down one end and the clip of a scotch lock fitted it and glued the plastic shut-replaced plastic coil having filed end smooth.
10 yrs on and 150k I was still happy to replace the MAF, but worry that this is a chaffed and corroded wire within the loom and its factory protection.
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