Question about 1999 Volvo V70
PO505 is idle control system malfunction. PO446 is evaporative emissions ( evap) vent system performance . PO443 is evaporative emission control sytem purge control circuit malfunction. PO135 is O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) PO141 is 02 Sensor Heater Circuit Malfunction (bank 1 sensor 2) Now what does all this mean. It means your O2 sensors are being effected by a problem upstream. Could be a many things. If the engine runs perfect then it may be one bad O2 Sensor but it may not. My advice is to have this diagnosed by a trusted mechanic who has the tools, skill, and knowledge to find the problem and not just throw parts at the problem. You can spend lots of money on this unless you know exactly what is causing all these codes.
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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