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Diagnostic Trouble Code: B1255
Diagnostic Trouble Code Name: Air temperature external sensor circuit open
Vehicle Make: Ford
Vehicle Model: Falcon (FG)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Post Catalyst O2 Sensor Fuel Trim Above Upper Limit Bank 1
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P2097 or P2099
Circuit / System Description
Fuel trim bias is used by the ECM to keep the post catalyst HO2S voltage within a range of 580-665 mV. This allows optimal catalyst efficiency under light load conditions, such as at idle or a steady cruise. The ECM constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.
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