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Hope this helps you or future parties of intrest. P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1 P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2 I would get under your stang and gently clean outside portion of o2 sensors using a scotch brite. Also if you have so dielectric grease pull electrical connections to o2 sensors clean them and add grease. These trick eliminated the o2 sensor OBD1 codes on my 1987 Ford mustang gt
CODE PO175 FUEL TRIM SYSTEM RICH BANK 2 CONDITIONS THESE ARE YOUR POSSIBLE CAUSES. YOUR EVAP CANISTER FUEL SATURATED.YOU COULD HAVE A BAD ECT IAT MAF SENSOR.YOU COULD HAVE RUPTURE FUEL PRESSURE REGULATOR.ALSO A LEAKING FUEL INJECTOR.
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