I have a 99 acura tl and the codes p0420 and p1456 are causing my check engine light

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rigga2k1

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to come on? i wanted to know what do these codes mean i have to get fixed and i think a cover from my cat. conv. came off my car gives of a vibration when i come to a complete stop like its trembling i wanted to know what the problem was and where can i go to get this fixed and how much can this all cost to get fixed in detail
 
they are emission codes I dont know how much to repair or what exactly the problems but I hope this got you into the ballpark of the problem
 
A certified master mechanic shouldn't tell you that a plugged catalytic converter will set a p1456. A p1456 is an evap malfunction. This DTC cannot set because of a plugged catalytic converter. Chances are the vibration you feel at idle is most likely a faulty engine mount, if not more than one.

The Catalyist code will most likely set because of a faulty catalytic converter. It is possible that a plugged secondary o2 sensor signal chamber can cause a p0420 but very unlikely.

The Evap DTC, p1456 is a tank side leak in the evap system. Usually caused by a loose gas cap. But, can be caused by many actual failures in the system. Leaks are one cause of this DTC. It has the potential to be a dangerous situation if you have a leak because this is, after all, part of the fuel/tank system!

You can probably just have the Catalytic converter replaced. However, the p1456 will most likely require diagnostics that only a trained professional with proper equipment can offer. I honestly recommend the dealership for this DTC. They will be able to offer the most reliable and efficient diagnostic for you.
 
P0420- catalyst failure.
P1456- evap system malfunction

You should have the catalytic converter replaced.....it is plugged up, causing rough running and setting the 420 code. It is possible the backpressure in the exhaust is setting off the other code.....so do the converter 1st, then clear out the codes and retest.

Get the prices yourself......we don't know where you live or how much other shops charge nationwide. Or if you "know a guy".
 
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