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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 12-17-2009, 03:44 PM
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Exclamation O2 sensor cause check engine light to come on

I have a 2004 ram 5.7 hemi, I recently put a k&n cai, pacesetter long tube headers with not cats and three inch all the way to flowmaster super 44 mufflers, I also have a superchips cortex programmer. My problem is once I instaled the exhause sytem and started the truck my check engine light came on. My programmer says that the O2 sensors are hot, my rear O2 sensors I did not put back on. What can I do to solve the check engine light without putting the cats back on, and will any of this effect the performance and reliability of the truck? Does anyone also know of a place in texas where I can get a custom tune for this truck?
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Old 12-17-2009, 05:35 PM
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O2 simulators .
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Old 12-17-2009, 06:06 PM
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Do you know of anywhere I can find O2 simulators? What if I put the 2nd O2 sensor back into the exhaust with spark plug non foulers, will this solve the problem? I have heard of some people doing this. Thanks for your previous suggestion.
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Old 12-17-2009, 06:18 PM
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No, it wont because the downstream O2 sensors are there to monitor catylist efficiency and they would send back the same voltages as the upstream sensors causing a code for a bad converter to set.
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Old 12-17-2009, 08:49 PM
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Have to have a O2 sensor bung welded in . Then by putting the sensor in a fouler and threading the fouler into the bung takes the sensor out of the exhaust stream . There fore no reading . I haven't seen it done myself , but have been told by several people it works .
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Old 12-17-2009, 09:00 PM
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I can't help but think that installing a resistor between the O2 signal and ground on the 1/2 and 2/2 sensors would be a lot easier than welding a bung into the pipes. It would just be a matter of figuring out the proper resistence.
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Old 12-18-2009, 12:25 AM
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use 2 non foulers per 02 sensor (rear), stuff the bottom one with steel wool, the top one has to be drilled out a little so the 02 sensor can thread in. I have it on mine and i run lt headers, gutted cats, no codes..
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Old 12-18-2009, 12:26 AM
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also, what is the exact code that popped up..
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Old 12-18-2009, 09:50 AM
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Codes that appear:
P0404 egr position sensor performance
P0034 o2 sensor 1/2 heater circuit high
P0058 o2 sensor 2/2 heater circuit high
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Old 12-18-2009, 09:54 AM
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Yup, leaving them off will set those codes. You need to replace that EGR valve too.
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