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My 2000 Ford Windstar failed the emissions test with (3) codes. on 2000 Ford Windstar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
P0135-02 Heater sensor heater circuit malfunction bank 1 sensor 1, P01131-Manufacturer specific code, P0171-System too lean bank 1.
(1) Answer
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THE PO 171 IS POSSIBLE VAC LEAK IN BANK 1, HEATER CIRUIT POSSIBLY BAD IN SENSOR OR CIRCUIT
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