Code 41: Could it be the O2 sensor itself?
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From: northern, virginia, USA
Code 41: Could it be the O2 sensor itself?
I recently swapped my stock O2 sensor for a Bosch one, because I thought my oem one was going bad. I never threw a code with the OEM one, but the Bosch one throws a code 41, o2 sensor heater. Since I didnt mess with any wiring, I simply unplugged one and plugged in the new one, could the o2 sensor itself be the problem? I am only asking because everywhere I have seen the code 41 discussed, the problem is always blamed on wiring, and I need to know if the sensor itself could be the problem.
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From: Cincinnati,, Oh
Re: Code 41: Could it be the O2 sensor itself? (VTEC-DA)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTEC-DA »</TD></TR><TR><TD CLASS="quote">I need to know if the sensor itself could be the problem.</TD></TR></TABLE>
It usually is.
It usually is.
Joined: Aug 2003
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From: MediumCity, Oh, USA
Re: Code 41: Could it be the O2 sensor itself? (VTEC-DA)
What car? How much is modified?
Unplug the HO2S connector. Find the two wires for the heater circuit (engine harness) and check it for battery voltage with the key on (it should be the black/yellow, black/white wires). If you don't have voltage, check the 7.5 A fuse (fuse 15?). If the fuse is blown, I think there's was a problem with the harness behind the intake (grounding out on a bracket) but I can't remember all the details (it's a service bulletin).
If you have battery voltage, check the corresponding wires on the HO2S. I'm not sure what the resistance should be for a Bosch but I think it's not more than 50-100 ohms. The main thing to check for is a short or an open.
Modified by AngryTroll at 2:36 PM 9/2/2003
Unplug the HO2S connector. Find the two wires for the heater circuit (engine harness) and check it for battery voltage with the key on (it should be the black/yellow, black/white wires). If you don't have voltage, check the 7.5 A fuse (fuse 15?). If the fuse is blown, I think there's was a problem with the harness behind the intake (grounding out on a bracket) but I can't remember all the details (it's a service bulletin).
If you have battery voltage, check the corresponding wires on the HO2S. I'm not sure what the resistance should be for a Bosch but I think it's not more than 50-100 ohms. The main thing to check for is a short or an open.
Modified by AngryTroll at 2:36 PM 9/2/2003
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From: northern, virginia, USA
Re: Code 41: Could it be the O2 sensor itself? (AngryTroll)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AngryTroll »</TD></TR><TR><TD CLASS="quote">Didn' t you post something about failing an emission test? Did you fail the test with the OEM HO2S? </TD></TR></TABLE>
Yeah, I did. The OEM O2 sensor never threw this code, just the Bosch one.
Yeah, I did. The OEM O2 sensor never threw this code, just the Bosch one.
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From: Severn, MD
Re: Code 41: Could it be the O2 sensor itself? (VTEC-DA)
Unplug the O2 from the engine wiring harness. Grab your multimeter and measure the resistance of the heater section of the O2 sensor. Should measure between 14-30 ohms...if not, replace your O2.
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