just pulled the cel off my accord.

it's on my turbo'ed accord, the o2 sensor prolly got knock out already.

it's cel 65 and 41

heater circuit malfunction

Oxygen Sensor Heater (Secondary) malfunctioning or defective oxygen sensor heater

what should i do? the thing is that my o2 sensor(primary) is replaced and it still throw me the code(soft code).
Should i go ahead and put on the secondary one or else what should i do?

thanks in advance

 

Sometimes with the addition of an aftermarket turbo you have to add a secondary o2 sensor. i would try that.

 

O2 sensors don't read very accurately until they get up to their proper operating temperture. that takes a couple minutes under normal operating conditions. They put a heater in the O2 sensor so that it will warm up quicker. This lowers cold start emissions.

If you can live with the CEL, it's not an issue. You are just putting out a little bit more emissions for the first couple of mins the car runs.

 

Will a new O2 sensors do the trick?
or where should i look?
Jweller, once again i want to thank you.

 

Sensor heater circuit is just a 12v power supply to work the heating element that's built into the O2 sensor. Unplug the sensor, check continuity thru the heating element with a DMM. If that's open, then all you can do is get a new sensor. If it's OK then you check to see if there's really 12v power at the plug. If not, then you gotta look for blown fuses or broken wires...

 

which fuse should i be check?
I already got new oxygen sensor installed, same code pop put after
a while.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">which fuse should i be check?
I already got new oxygen sensor installed, same code pop put after
a while.</TD></TR></TABLE>
What year and model?

 

just saw this link posted. thought you might find it interesting. It's about how the O2 sensor works

http://www.bondauto.com/templa...id/20

 

accord 2002 ulev 4 cylinder(up)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chiovnidca &raquo;</TD></TR><TR><TD CLASS="quote">
What year and model?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">which fuse should i be check?
</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">accord 2002 ulev 4 cylinder(up)

</TD></TR></TABLE>
Fuse #6 in the drivers under dash fuse box.

 

My Helm book only covers '98 & '99, but for the F23A4 engine (is that what you got?), fuse #6 on the passenger's side is also involved, and there's a relay somewhere, too.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">My Helm book only covers '98 & '99, but for the F23A4 engine (is that what you got?), fuse #6 on the passenger's side is also involved, and there's a relay somewhere, too.
</TD></TR></TABLE>
Your right, I missed the ULEV part.

 

Let me check it right now...

 

put in new o2 sensor for primary and secondary, one code is gone.
Only code 41 is left, checked fuse the fuse is good.
what should i do? will it harm performance in anyway?

 

41 is the heater circuit for the primary O2 sensor. If it's like '98/'99, that's the one with a relay. Check to see if you have 12v power for that heater, then get a circuit diagram for your car (got a Helm book?) Check wiring & relays 'til you find an open (disconnected) wire someplace. We had you check fuses since they're easier to check & more likely to be the cause of the trouble. You're gonna learn to your DMM...

Without a heater, the O2 sensor takes longer to get hot & start working. But I'm not sure whether the heater stays on & keeps the sensor hotter than it would be if it was just heated by the exhaust.

 

thank alot..i dont have the helm
where is the fuse located at? i want double check the fuse too.
what's the name of the fuse?

the heater is the black wire right?(i have 2 black btw)
I have the primary sensor extended(with solder and wires) for the header.
do you think that might cause it?

 

I'm not sure, I don't have my repair book with me. Besides, it's not for your year, so I gotta be careful about that.

You have a F23A4? In '98 & '99 that was fuse #6 on the passenger side. I don't know where the relay is located, I don't have that engine & I only spent a couple minutes looking for it. It might not be the same for '02 anyway.

The heater leads coming from the sensor should read some (finite) resistance. When the sensor is cold I think the leads for the sensor itself will look like an open circuit.

If you did an OK job soldering the wires, that shouldn't be the problem.

 

Just installed a working condition oem honda o2 sensor and guess what?
the cel came back on.

I checked the fuse, it's fine.

what's going on??

 

Bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">Just installed a working condition oem honda o2 sensor and guess what?
the cel came back on.

I checked the fuse, it's fine.

what's going on??</TD></TR></TABLE>
Have you checked the wiring And connectors back to the ECU?

 

I had same problem...Go to Autozone and for $89.99 you can get a shinny new o.e.m. o2 sensor...i thought it was my heater circuit when i got code 41 but it was the sensor itself... before you spend any money check your driver side fuse box located right in front of the door by your pedals. Chances are o2 sensor needs to be replaced.

 

tried new oem sensor also, same code.

the sensor got hot like **** after 20-30 second with it unplug sitting out side of the downpipe=circuit=working

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">tried new oem sensor also, same code.

the sensor got hot like **** after 20-30 second with it unplug sitting out side of the downpipe=circuit=working</TD></TR></TABLE>
Do you have access to another ECU to try?