2000 Ford Mustang MIL keeps coming on

2000 FORD MUSTANG
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MUSTANGMAN1
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Computer problem
2000 Ford Mustang 6 cyl Manual 116000 miles
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Hi, I've just recently installed a dual conversion exhaust system on my v6 mustang which includes an x-pipe with high flow cats. I have a DTC PO156 and PO161. I have already had to replace the Oxygen sensor 1 Bank 2, and Oxygen sensor 2 Bank 2. After i drove approximately 11 miles the engine light came on again! I don't know what else to do. What can cause this to happen???
Sep 2, 2008 at 2:28 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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