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P0420 Diagnostic Trouble Code Discussion for April 2015

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0420
Help Request Posted
1996 Ford F-250 XL 7.5L Hesitation, MIL Lamp on VIN: 1FDHF25G0T
P0420: CAT EFFICENCY NO cat. ... pcm p0172, p0175, p0171 and p0420. upon inspection noticed that vehicles CAT had been removed so please ignore p0420. checked freeze frame data code p0172 STFT B1 -3.9 STFT B2 0 LTFT B1 -10.9 LTFT B2 -12.5 LOAD 57.6% ECT 1...
April 04, 2015
1996 Ford F-250 XL 7.5L Hesitation, MIL Lamp on VIN: 1FDHF25G0T
P0420: CAT EFFICENCY NO cat. ... pcm p0172, p0175, p0171 and p0420. upon inspection noticed that vehicles CAT had been removed so please ignore p0420. checked freeze frame data code p0172 STFT B1 -3.9 STFT B2 0 LTFT B1 -10.9 LTFT B2 -12.5 LOAD 57.6% ECT 1...
April 07, 2015