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It sounds like a coolant sensor problem. It could be as simple as replacing a sensor. It's tough because Volvo gives the worst descriptions for computer problems. "circuit low" sounds like the sensor is not getting a correct signal.
 

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Re: (cmurphy2266)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>cmurphy2266</b> »</i></TD></TR><TR><TD CLASS="quote">It sounds like a coolant sensor problem. It could be as simple as replacing a sensor. It's tough because Volvo gives the worst descriptions for computer problems. "circuit low" sounds like the sensor is not getting a correct signal. </TD></TR></TABLE><br>+1... or maybe a thermostat?
 

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Discussion Starter · #6 ·
Re: (cmurphy2266)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>cmurphy2266</b> »</i></TD></TR><TR><TD CLASS="quote">Who read the code for you? Something like Autozone or a Dealership? </TD></TR></TABLE><p>I used a code reader from autozone. <p>Do you suppose its still good to go for a while? I need to drive to Portland this weekend.<br>I will not be having the heater on <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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II hate to say it, but, if you dont know what your talking about, please dont lead others astray...<p>That being said, the code refers to your heated oxygen sensor behind the catalytic converter. The heater circuit is not functioning properly. It could be the sensor itself, could be a fuse, could be damaged wires, or a bad ground. Chances are you would need some assistance in diagnosing any of the other problems, so throwing a sensor at it is probably your best bet.
 

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The heater is a part of the O2 sensor. It heats up the oxygen sensor so that it can start reading the exhaust gases. I would clear the CEL, and if it comes back up I would advise you to replace it.
 

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Ya code P0037 is Signal too low in preheating of the o2 sensor, I would see if the connection is good if not then replace the rear o2.
 

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Re: (2002VolvoS60)

So it doesnt sound like anything is gunna blow up then. I cleared the code and will take my chances.<p>If it comes back I will check it out further.<p><br>Thanks guyz!
 

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my buddy just replaced this on his RSX-S yesterday - 200 bucks or so and 20 minutes of easy DIY.
 
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