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Where is Bank 1 and Bank 2 oxygen sensors located or S11 switches on 1997 Ford Expedition. Code P1131 P0171 P0174. Says system too lean.?
Wiki User
∙ 17y ago
p0171 and p0174 are generic codes, they could be just about anything. i got them and realized i had a vaccume leak on the hose that connected to the pcv valve. check your valves and hoses going to you intake I had a customer with this problem and it was caused by a fouled mass airflow senor. The cutomer installed the air filter backwards which caused the injectors and MAF sensor to get fouled up. Injectors werent giving enough fuel to the engine. The injectors needed flushed out and Blew the mass air flow out. I recommend the mass air flow sensor be changed out when this happens bc it will never be the same. I hope this helps some.
Wiki User
∙ 17y ago
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