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Reads code P1457 and code P0420 - 1999 Honda Accord

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Posted on Jan 02, 2017

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SOURCE: P1457 honda light off but still reads code

The light on the dash, should do a bulb check when you first start the car. (bulb should illuminate for 3 seconds) after that the light will go out. then if there is a code in the computer it will come right back on . bulb could be burned out. a po 1457 is a evap code which is fumes or fuel vapores from the fuel tank .these fumes go through vacuum lines from the tank, back to the vacuum canister under the hood. then these vapors are purged to the engine to be burned with the fuel. you need to check all vacuum hoses going from the tank ,to the charcoal canister (vacuum canister) this is most cases about the size of a coffee can .around the front of the engine compartment. black plastic. with vacuum lines going to it. if there is a vacuum hose cracked, or off .it would cause a po 1457. service manual says- evaporative emissions ( evap) control system leakage (evap canister system) this problem is hard to repair eve for the skilled tech good luck

Posted on Sep 15, 2011

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?

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The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

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I think you got misinformed about what fault P0420 is, the GM manual says this: "P0420 - Catalyst System Low Efficiency" What does that mean? it means the main catalytic converter in the exhaust system is worn out, it could be the Catalyst monitor that is bad, it is what triggers the code when it reads a certain voltage from the system, but that is rare, you could replace it (the catalyst monitor) and see if the code clears, if not you will need a new main Catalytic Converter.

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01 sienna with p0420 not sure if its the cat. or the o2

This code occurs very very frequently on these vans. I have come across probably 50 or more in the past few years and to date I have not had a single one that was an O2 sensor and NOT throwing any other code than P0420.

Unfortunately, the only way to verify 100% is to read the sensor output with a scan tool capable of live-data playback. If you have access to one, you want to verify activity on the rear O2 sensor on the firewall side (Bank 1 Sensor 2). Under normal conditions you should have activity on the sensor that varies with gas pedal input, but does NOT exceed 20% of the front sensor value (Bank 1 Sensor 1).
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