P0038 Help please

seisephiroth · Post by **seisephiroth** » Sat May 10, 2008 2:24 pm

P0038 HO2S Heater Circuit High Voltage Bank 1 Sensor 2

I have an 04 srt-4

could someone turn that into plain english for me and tell me how to fix it please

thanks in advance

aperson · Post by **aperson** » Sat May 10, 2008 7:57 pm

Replace the downstream O2 sensor. It's in the cat. The internal O2 sensor heater has shorted out/ broken. The only way to fix is to replace it.

seisephiroth · Post by **seisephiroth** » Sun May 11, 2008 6:31 pm

what if I have no cat and have the spark plug defowler mod?

aperson · Post by **aperson** » Sun May 11, 2008 8:35 pm

I believe that you still have to replace it because there isn't a mod to fix/modify the heater circuit. All the defowler mod does is take the O2 sensor out of the exhaust flow so that it isn't reading everything that is there, it doesn't change the heater circuit.

cbjones26 · Post by **cbjones26** » Sun May 11, 2008 8:56 pm

aperson wrote:I believe that you still have to replace it because there isn't a mod to fix/modify the heater circuit. All the defowler mod does is take the O2 sensor out of the exhaust flow so that it isn't reading everything that is there, it doesn't change the heater circuit.

shit that non fouler mod doesnt even work that long.. only lasted around 1000 miles an cel came back on!!

<--- also has no cat!!

Post by **occasional demons** » Sun May 11, 2008 9:10 pm

The only mod would be to find out how much resistance the heater has, then find a resistor with the same value, durable enough to use as a substitute. Other than that you will either have to buy a new one or find a used one and hope the heater is working. I would think a cheaper aftermarket one would work fine as the quality os the o2 part isn't a concern in this case. Wasting $110+ would not be my personal choice to fix something I've bypassed! I don't know that a shorted heater will damge the PCM, but you may consider cutting one/both of the white heater wires to prevent damage to the PCM, (on the sensor side of the connector obviously) till you find a replacement. The grey and black should be for the oxygen sensor part. Don't cut those or you will get another code. If you do cut them wrap the ends to prevent shorting to ground, too.

seisephiroth · Post by **seisephiroth** » Sun May 11, 2008 9:13 pm

lucky i've got a spare o2 sensor already x3

though I might try the resistor trick

Post by **occasional demons** » Sun May 11, 2008 9:36 pm

Spares FTW!

seisephiroth · Post by **seisephiroth** » Mon May 12, 2008 5:07 pm

blast it the one I have is only a 3 wire