1995 Ford Thunderbird Malfunction - Engine


Question: We have a 95 Tbird with a 4.6L V8. The check engine light keeps coming on. We have had all four oxygen sensors changed within a 3 month period. SPark plugs and wires were changed last year and the EGR valve replaced. The engine runs smoothly and idles fine. We also had the coolant temp sensor replaced. The mechanic said that according to the code, the engine was running lean. We would cancel it out by disconnecting the NEG battery terminal and in about a week, the check engine light would come back on. We checked for vaccum leaks but found none. Any idea why that light still comes on even when there is no apparent change in the cars starting or driving ?

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