Usamos cookies para análises básicas — nada é carregado até você aceitar. Você pode recusar e continuar navegando normalmente. Política de Privacidade
Diagnostic trouble code B1257 indicates: Air Temperature External Sensor Circuit Short To Ground. It was set by your vehicle's onboard diagnostics system and will typically keep the check engine light on until it's addressed.
Upload your ECU file and DTC Doctor will detect this code (and any others) automatically, then remove it for good — no dealer visit, no guesswork.
Analyze My File Free →