Hi,

My honda accord, 1999 sport, vreg is giving off the fault code 41 which is - Primary oxygen sensor heater.

How could i resolve this? I have changed my oxygen sensor new one but still troubles.

Does it need a new relay or a new curcuit or wires checked?

Cheers

 

ok, normally when it throws a 41 its just the o2 sensor if your lucky,check your voltage on while the engine is running from cold start, voltage should be at .1-.2V, after a period of about 2 min or so it should go into closed loop and read .1-.9 volts, if it dont then its ur o2 sensor, or you might just try unpluggin the battery for a couple minutes 2 reset the ecm, that is since you say you put in a new o2 sensor

 

Actually, his code is for the 'heater' cicuit of the O2 sensor, not the output.

If he replaced the O2 and wired it correctly he shouldn't have a CEL anymore. But yes, the ECU should be reset and then see what happens. If he still gets the code 41, I would suggest measuring the voltage of the heater circuit on a cold engine at the O2 sensor.

 

The car measured no voltage at all on the heater wires.

Why is this?

How can i resolve this?

Regards

 

up, i just got the same problem. code 41. help me out here

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by samvtecaccordsport &raquo;</TD></TR><TR><TD CLASS="quote">The car measured no voltage at all on the heater wires.

Why is this?

</TD></TR></TABLE>
Fuse or wiring maybe?

 

up

 

are you running stock headers? alot of time when you get a set of 4-2-1 headers it only has one o2 plugg next to the cat. if so youll have to get ur ecu chipped to bypass the first o2 sensor. i had the smae prob. for 3 months