any way to test an O2 sensor?
Honda-Tech Member
Joined: Mar 2002
Posts: 9,854
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From: Southern California, U.S.A.
Re: any way to test an O2 sensor? (madhatter07)
The only good way to test an O2 is with it hooked up and the car running. Voltage should fluctuate between 0.1-0.9 volts. Does not have to go from 0.1 up to 0.9, just in that range. An O2 sensor that reads more than 1.0 volts is bad, and one that does not fluctuate at all is also likely bad.
Honda-Tech Member
Joined: Apr 2002
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From: Cincinnati,, Oh
Re: any way to test an O2 sensor? (b19coupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe »</TD></TR><TR><TD CLASS="quote">The only good way to test an O2 is with it hooked up and the car running. Voltage should fluctuate between 0.1-0.9 volts. Does not have to go from 0.1 up to 0.9, just in that range. An O2 sensor that reads more than 1.0 volts is bad, and one that does not fluctuate at all is also likely bad. </TD></TR></TABLE>
What if the engine is running either lean or rich? The o2 wont flucuate in that case, but may be working fine. How do you measure response time? A slow acting o2 sensor can fluctuate between .1-.9 volts and still be bad if it does it too slow. Should he consider checking the heater circuit? How would you do that?
What if the engine is running either lean or rich? The o2 wont flucuate in that case, but may be working fine. How do you measure response time? A slow acting o2 sensor can fluctuate between .1-.9 volts and still be bad if it does it too slow. Should he consider checking the heater circuit? How would you do that?
Honda-Tech Member
Joined: Mar 2002
Posts: 9,854
Likes: 4
From: Southern California, U.S.A.
Re: any way to test an O2 sensor? (Chiovnidca)
I was trying to give a simple, general idea of how to test O2 sensors for the average Joe on the streets. The best way to test an O2 is with a Digital Storage Oscilliscope, look at the cross counts etc. As far as the O2 sensor heater, I would just test for shorts or opens in the heater circuit-would have to look up the specified heater resistance value...
Honda-Tech Member
Joined: Apr 2002
Posts: 7,574
Likes: 6
From: Cincinnati,, Oh
Re: any way to test an O2 sensor? (b19coupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe »</TD></TR><TR><TD CLASS="quote">I was trying to give a simple, general idea of how to test O2 sensors for the average Joe on the streets. The best way to test an O2 is with a Digital Storage Oscilliscope, look at the cross counts etc. As far as the O2 sensor heater, I would just test for shorts or opens in the heater circuit-would have to look up the specified heater resistance value...</TD></TR></TABLE>
Most o2 heaters on Hondas should measure between 4 and 10 ohms.
Most o2 heaters on Hondas should measure between 4 and 10 ohms.
