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Check your exhaust flexies - it's common for them to leak and the exhaust can suck in air between pulses, upping the exhaust O2 content. the Sensors measure this air, and up the fuel trims to "compensate". When they don't see the difference they expect, they trigger the code.

It happens, because even when it enrichens the trims, the same amount of air leaks in and it's only measuring the O2 content, so even though the system is running rich, it sees it as lean from to much O2.
 
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