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P1299 Diagnostic Trouble Code Discussion for July 2009

Vacuum Leak Present With IAC Valve Fully Seated


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Trouble Ticket Help Requests for DTC P1299
Help Request Posted
1997 Ford Expedition Eddie Bauer 4.6L MIL Lamp on, CHT over temp VIN: 1FMEU18W6V
P1299: Over temp by pass. ... on every warm up cycle and on about the 3rd or 4th time the P1285 sets, it sets a P1299 and goes into “fail-safe" bypass which is designed to prevent engine damage due to overheating. I understand the strategy of the m...
July 09, 2009
1997 Ford Expedition Eddie Bauer 4.6L MIL Lamp on, CHT over temp VIN: 1FMEU18W6V
P1299: Over temp by pass. ... on every warm up cycle and on about the 3rd or 4th time the P1285 sets, it sets a P1299 and goes into “fail-safe" bypass which is designed to prevent engine damage due to overheating. I understand the strategy of the m...
July 09, 2009