i got a code of P0141 "O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)" couple of days ago and erased the code then today it came back. i did some research on this code that it might be the #15 fuse (7.5) or it could the the connection on the engine bay (from the sensor) "The engine wire harness is rubbing on the intake
manifold bracket."

http://www.tegger.com/hondafaq/tsb/civic/x99-029e.pdf

if these 2 are ok.. i just have to replace the 02 sensor (secondary)?

btw, is front, primary? and rear is secondary?

Honda Part #'s
36531-P2E-A01 = FRONT (#8)
36532-P2E-A01 = REAR (#9)

Replacement Parts:

NGK/NTK
NTK24542 = UPSTREAM
NTK24633 = DOWNSTREAM

DENSO
234-4099 = UPSTREAM
234-4065 = DOWNSTREAM

 

ok, i checked fuse #15 (7.5) and its not blown. i didnt check the wiring on the engine bay because my fuse is ok. yesterday CEL came back again (3rd time) coz i keep on erasing it. so i was thinking maybe its really the sensor.. but which one?

 

Secondary = rear

How do you know fuse 15 is not blown?

You can resistance test the heater element of the O2 sensor - it should read 10-40 Ohms.

 

Ohm the p2p heater. If it is open replace the sensor. Also put a test light across the heater terminals on the car side of the harness and turn the key on. If the test light illuminates chances are the circuit is ok and condemns a p2p sensor.

 

O2 sensor. Spellcheck

 

ok.. the lower part..

i checked it and its still good.

actually i dont have the proper tool to do that and i dont know where the heater element is located.

i actually dont know how to this thing.. i dont even know whats that p2p element you're talking about..

will the ngk or denso works? OEM is too expensive.

 

i have used ones from a junkyard for 30 plus ship i can test it on my car before it ships.

 

How? It's best to voltage test installed fuse with a multimeter.

You can buy a digital multimeter for $4 at Harbor Freight.

The heater element is built into the O2 sensor. You measure resistance of those two wires.

 

i checked the fuse $15 and still not blown. so if i buy that digital multimeter where do measure the resistance? from the O2 sensor?

im about to buy the secondary sensor though..

 

Start by testing whether the Blk/Yel wire in the unplugged secondary O2 sensor connector gets battery voltage to body ground (wire harness side; key in ON(II)). If so, then move to the sensor side plug and measure resistance across the two black wires. You should read 10-40 Ohms.

 

ok. but i still need to buy that $4 multimeter from harbor freight. i will keep this thread updated after i do these tests. thanks!

 

Denso will be fine