1998 Honda Accord P0420 and P1739

1998 HONDA ACCORD
110,000 MILES • 4 CYL • 2WD • AUTOMATIC
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DEREKSON16
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I noticed the "check engine" light stay on everytime I drive my 1998 Honda Accord. I took it to the mechanics at Strauss. They used the Engine Code Scanner and got the codes P1739 and P0420. They weren't sure what those codes meant. How do I find out exactly what the problem is and what needs to be fixed?
Jun 17, 2008 at 2:43 PM
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KHLOW2008
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Hi Derekson16,

P0420 should be a problem with the catalytic convertor, O2 sensor or emission control system.

P1739 is related to the transmission.

Does the D4 light blinks while driving?
Jun 17, 2008 at 4:35 PM
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DEREKSON16
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No, Its a steady D4 light. No blinking
Jun 17, 2008 at 4:55 PM
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KHLOW2008
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Hi Derekson16,

If the gear shifting are all normal, then don't worry about the P1739 code first.

Erase the code and get the P0420 solved first.

The engine error takes precedence over any other error and solving it might cause other errors to be rectified.
Jun 18, 2008 at 7:08 AM
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DEREKSON16
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Ok sounds good. But how do I know which part of P0420 needs to be fixed, whether its the sensors cat converter or what. How do I know what to tell the mechanic?

Thank You Very much
Jun 18, 2008 at 7:37 AM
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KHLOW2008
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Hi Derekson16,

The best is to do a diagnostic data test where you can find out whichever component not performing within specs.

You can ask your mechanic to do a visual inspection of the cat converter but sometimes you won't see much except if it is clogged or internally corroded.
Jun 19, 2008 at 7:38 AM