fault code

P1407 P1407 refers to an EGR no flow condition or inoperative EGR valve. Check this link for important information regarding this code. http://www.ask-sparky.com/2009/01/1996-mazda-626-code-p1407.html P0171 is a lean condition code, causes could be • Misfire • HO2S (front) deterioration • HO2S (front) heater malfunction • PRC solenoid valve malfunction • Pressure regulator malfunction • Fuel pump malfunction • Fuel filter clogged or restricted • Fuel leakage on fuel line from fuel delivery pipe and fuel pump • Fuel return hose clogged • Leakage from exhaust system • Purge solenoid valve malfunction • Purge solenoid hoses improper connection • Insufficient compression P0303 is misfire number 3 cylinder All will be related.