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Boxster fault codes
My 1997 Boxster keeps getting codes P0140, P0154 and P1117. Oxygen sensors have been replaced 3 times. Engine runs fine with no symptoms of anything being wrong. Since this always concerns the same bank, can I expect wiring is the problem? If not wiring what would cause CEL to come on? Total mileage has been less than 3000 miles over 5 years.
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