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Old 07-13-2009, 08:51 PM   #1
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P0155, P1151 trouble codes

Hey guys, i have these codes, happened shortly after CAI, TB, and Plenum install
P0155.... says o2 heater circuit, bank 2, sensor 1

P1151.... says lack of Ho2s21 switches...sensor indicates lean

do i just need a tune or is it is a o2 sensor
thanx in advance
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Old 07-13-2009, 10:45 PM   #2
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anyone, please help a poor noob
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Old 07-13-2009, 11:50 PM   #3
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probably a sensor, but make sure its plugged in first
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Old 07-14-2009, 08:11 AM   #4
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Check the pins on any plug that you unplugged.
It may be just a bent pin.
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Old 07-14-2009, 09:38 AM   #5
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The second code indicates that the o2 sensor is not working. As mentioned above check for a disconnected harness or bent pin. The next step would be replacing the oxygen sensor.

FYI, I had the same code. Visually checked everything and then replaced the oxygen sensor. Still had the same damn code. I pulled the transmission/o2 harness, but couldn't find the short. Every time I checked the wires, they showed continuity. I ended up buying an o2/transmission harness on ebay for $20. No more problems after that. Just something to keep in mind, if all else fails.
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Old 07-27-2009, 09:10 PM   #6
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thanks guys, will replace o2 sensor
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Old 07-28-2009, 06:41 AM   #7
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I had that problem one time and it was the 02 heater fuse in the box under the hood.
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Old 07-28-2009, 08:17 AM   #8
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Why would an O2 sensor go bad after a CAI, TB, plenum install?
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Old 07-28-2009, 08:42 AM   #9
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Because it says MUSTANG and/or FORD on the vehicle.
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Old 07-28-2009, 01:07 PM   #10
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i am gettin the p1151 also but mine comes and goes for some reason anyone got any ideas for that? i was thinkin that it could be one of the pins bent like ya'll said but wasn't sure, any input before i check?
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Old 07-29-2009, 08:29 AM   #11
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LOL Tony.
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