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My check engine light was on in my 99 honda civic dx and so i fixed the problem which was my o2 sensor heater and when i go and get it inspected there saying the codes are not ready, i have driven the car 150 mile since ive changed the o2 heater and tried to get it inspected again and its still coming up not ready. What do i do?

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Unhook battery for about a minute them reconnect this will erase all codes

Posted on Mar 22, 2011

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Errror code P0420 honda Civic 99

I recommend having the code cleared professionally or with a scan tool and see if the light comes back on. The secondary sensor is usually located on the opposite side of the catalytic converter, it's there to monitor the cat efficiency. The problem may be fixed, you just need to have the code cleared first. Let me know if this helps, thanks Matt.


Mar 05, 2013 | 1990 Honda Civic

1 Answer

Honda 1997 civic ex check engine light is on message: bank 1 sensor 2; heater circuit malfunction

that is the sensor that is behind the catalytic converter, it just measures effiicency of the cat itself-the sensor has a wire that pre-heats the sensor so that it goes 'on line' sooner, it has failed or is failing-the easiest thing to do is replace the O2 sensor, or you could ignore it until you have to go through emissions, and replace it a few days prior to inspection-but if you do that, and something else malfunctions that your check engine light would warn you about, you wouldn't know it-so it's probably just best to replace it when you can, in the near future. It will not affect at all how the car runs though.

Jan 26, 2011 | 1997 Honda Civic

2 Answers

I have a check engine light on my ob2 reads po135 whats that ?

o2 sensor heater circuit malfunction bank 1 sensor 1 you need to replace the 02 sensor

Aug 15, 2010 | 1998 Honda Civic

1 Answer

The check engine light is on on my 1998 Honda Civic DX, does it merely need to be reset using a code or is there something else. O2 sensor was replaced right before I bought the vehicle

The check engine light (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

Jun 30, 2010 | 1998 Honda Civic

1 Answer

How do I reconnect the check engine light. Is it just a bulb?

If your check engine light comes on then it will definitely not pass.There is no such thing as a code that says your sensors are bad. I could help you out more if i had the codes.If your sensors were bad you would get a heater failure code.But then again it could be anything.You need that code.

Feb 19, 2010 | 1998 Honda Civic

1 Answer

99 chevy blazer LS is popping out the tail pipe & carb code came up as po155

It is not a carb code as your vehicle has not carburetor. It is an OBD2 ECU code. What is means is that you have an O2 sensor heater circuit malfunction (Bank 2 Sensor 1). In your case I would recommend you inspect all the wiring going to that O2 sensor. If you find no problems then I suggest you replace the O2 sensor. The sensor to replace is on the passenger side, the sensor closest to the engine. This will more than likely fix your problem. After replacing the sensor reset the Check Engine Light. If the problem comes back then seek professional help and do not replace any other parts.

Dec 20, 2009 | 1999 Chevrolet Blazer

4 Answers

Code PO131

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.

Mar 11, 2009 | 1999 Honda Civic

2 Answers

My engine light won't go out even after sensors have been replace

remove brackett from under intake manifold to block you will see a gray or green plug look real close and you will see a bare wire or a wire that has been pinched real bad this wire controls heater circuit for the o2 sensors also check fuse # 15.there is a tsb from honda on this problem

Feb 18, 2009 | 1997 Honda Civic

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