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Can anyone tell me the location of the o2 sensors on a 99 sls? How difficult are these to replace? Parts house suggested changing as a result of P0420 and P0452 codes. Any help is greatly appreciated.
 

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White Diamond '03 DHS (with DTS floor shift)
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P0420 - Catalyst System Low Efficiency
P0452 - Fuel Tank Pressure Sensor Circuit Low Voltage

I don't think your problem is the O2 sensors.
 
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