Question about 1999 Honda Civic

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Code PO131 My '99 Honda Civic has 77,800 miles and I change the oil every 3,000 miles. I work at an auto deqlership so anything that goes wrong I can have repaired here., In December my check engine light came on and the computer noted to change the O2 sensor, so they did. All was well for about a week, then the check engine light came on again. Once again the computer noted to change the O2 sensor, so we did again. Everything was good until a week ago the check engine light came on again. This time the code PO131 came up. So now what??? The tech said that the car needed to be reprogramed by a Honda specific computer. Is this it???

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Code PO131 is O2 sensor circuit low voltage , bank 1, sensor 1. That sensor I would say is the one in the exhaust manifold. I would check voltage to the sensor from the computer. If the voltage is not 5 volts, then it could be a computer problem or a wiring problem. I have seen factory wiring and connectors give a voltage problem. Check for a damaged or burnt, pinched wire. You need to know for sure that the voltage is correct to the sensor. Intermittent problems are hard to trace , but patience and knowledge helps.

Posted on Mar 11, 2009

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Check the fuel pressure or try to change fuel pump.

Posted on Jun 27, 2013

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No you have 2 o2 sensors

Posted on Apr 25, 2009

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P0131 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1) - see our "articles" link for additional help with these generic check engine light codes

Posted on Mar 11, 2009

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