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Definition of check engine code P1331:
Alfa Romeo:
AC compressor clutch relay - signal malfunction
Daewoo:
#1 MISFIRE CIRCUIT - OPEN
Volkswagen/Audi:
Cyl.7 - Knock Contr. Limit Attained
Volvo:
Cyl.7 - Knock Contr. Limit Attained
Ford:
TURBOCHARGER / SUPERCHARGER BOOST HIGH SIDE CONTROL CIRCUIT / OPEN