Lindeland Posted March 21, 2011 Report Share Posted March 21, 2011 I recently just bought an 03 silverado ss. And yesterday while driving I threw a cel. It was running rough and wouldn't really accelerate. I went and scanned it and got the code PO155 o2s heater ckt malfunction 2/1. I'm assuming the o2 sensor is bad. Does 2/1 mean bank 2 front sensor? If so whichis bank 2, the drivers side or the passenger side? Thanks for any help. Quote Link to comment Share on other sites More sharing options...
tonycillo Posted March 21, 2011 Report Share Posted March 21, 2011 (edited) I recently just bought an 03 silverado ss. And yesterday while driving I threw a cel. It was running rough and wouldn't really accelerate. I went and scanned it and got the code PO155 o2s heater ckt malfunction 2/1. I'm assuming the o2 sensor is bad. Does 2/1 mean bank 2 front sensor? If so whichis bank 2, the drivers side or the passenger side? Thanks for any help. here is what i could find. P0155 Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Malfunction Possible CausesSetting Conditions HO2S heater connector is damaged (check pins for damage, and for moisture) HO2S heater control circuit is open, shorted to ground or shorted to voltage HO2S heater power (12v) circuit is open (check power circuit from EFI relay) HO2S heater has failed ECM has failed Engine running; and the ECM detected that the Bank 2 Heated Oxygen Sensor 1 (HO2S 2/1) heater current exceeded 2 amps, or it was less than 0.25 amps. This code sets in 2 Trip(s). This code will turn on the MIL (Malfunction Indicator Lamp) Edited March 21, 2011 by red04supersport (see edit history) Quote Link to comment Share on other sites More sharing options...
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