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P1133 Diagnostic Trouble Code Discussion for May 2013

Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching

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Trouble Ticket Help Requests for DTC P1133
Help Request Posted
1999 GMC C3500 Sierra SL 7.4L Poor Idle Quality, Poor Fuel Economy VIN: 1GDKC34J9X
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. came in with miss and running rough. found a miss fire on #3 installed plugs and wires,still had miss replaced injector.preformed compression test very low on 3 about 90 psi replaced engine test drive did ok cust drove come back skipping on number 5 and 7 we c...
May 02, 2013