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

P0135-02 Heater sensor heater circuit malfunction bank 1 sensor 1, P01131-Manufacturer specific code, P0171-System too lean bank 1.

by in Lawrenceville, GA on June 04, 2012
1 answer
ANSWER by on June 04, 2012
THE PO 171 IS POSSIBLE VAC LEAK IN BANK 1, HEATER CIRUIT POSSIBLY BAD IN SENSOR OR CIRCUIT