HELP! 92 E-150 5.0. Has "O2 not switching" code and MIL on intermittently. Runs really good considering 185,000 miles. O@ was staying in open loop. Installed new Motorcraft. Still stays in open loop. You can get it to go in closed if you hold eng. at 2,000 RPM...

FIX posted 12/10/2003

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