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What sensor is it and where is it located

Vehicle: 97 F150, 4.6

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P1154 Bank2 ,Fuel control shifted rich

P1134 Bank 1 Fuel control shifted rich

This is not a sensor but a condition, and a response to the condition such as a vacuum leak , from places such as the plenum gasket or intake manifold gasket ,and PCV hose or its connections, Look and listed  for a vacuum leak, you should be able to hear it, Use brake cleaner or carburator cleaner and spray at suspected area and it should make a noticable RPM drop.

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