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ford fiesta 1.4 zetec (petrol) - EAC FAIL code p2100 - fiestec

I bought my daughter a 52 reg 1.4 fiesta and its got the dreaded EAC fail, Ive tried chnaging throttle body and fuel loom but it still keeps returning. It shows an error code of P2100 H bridge error which I beleive is a fault between throttle body sensor and PCM. Has anybody else had this error code and how did you resolve it?

ford fiesta 1.4 zetec (petrol) - EAC FAIL code p2100 - Avant
Moved to Technical.