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The 5.0 liter V8 has ( 4 ) oxygen sensors

The 4.0 liter EFI ( which is an over head valve / pushrod design ) has ( 3 ) oxygen sensors

Note: The 2 upstream oxygen sensors are used for adjusting the air / fuel ratio of the engine , the other oxygen sensor (s) are called catalyst monitors and monitor the performance of the catalytic converter(s)

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