Oxygen Heater, Code 41

AzSi22 · Post by **AzSi22** » Wed Jul 28, 2004 6:48 pm

I recently had my car partial load tuned and for some reason it started to throw a code 41, O2 heater. I thought it was just a bad O2 sensor, but I replaced it with 2 known good ones but it hasn't gone away. My tuner had to diable the O2 heater so it won't throw the code. When the tuner hooked up the wideband, he hooked it directly up to the existing harness with a diode in it to bypass the heater. But now the code won't go away. Any input? BTW, the car is a 99 Si w/ p28, s200

DaX · Post by **DaX** » Thu Jul 29, 2004 4:00 am

Have you tried resetting the codes?

AzSi22 · Post by **AzSi22** » Thu Jul 29, 2004 9:30 am

Yes, and it comes back after 2 seconds after starting the car up.

AzSi22 · Post by **AzSi22** » Mon Aug 02, 2004 10:50 pm

I checked out all the wiring, but its all ok. Changed O2s, ran a new wire for the heater wire, no go. Anyone have any ideas?

dukduk · Post by **dukduk** » Fri Nov 05, 2004 6:20 am

you need to put a 20 watt, 40-60 ohm resistor between your heater wires

AzSi22 · Post by **AzSi22** » Fri Nov 05, 2004 10:52 am

dukduk wrote:you need to put a 20 watt, 40-60 ohm resistor between your heater wires

Actually, the ECU was faulty.

dukduk · Post by **dukduk** » Fri Nov 05, 2004 11:48 am

thats weird the same thing happened to a buddy