Question about 1987 Honda Accord
Already replaced catalytic converter, oxygen sensor, tune-up. Nocs too high on heavy load test by 600 points. Performed tests suggested in manual on Air Intake system. Solenoids don't seem to have vaccum but don't know if shouold replace the two solenoids or it iselectricial. Volt test lowon solenoid. Rewtired honda man confined to wheelchair with MS unable to perform all tests in manual. Any suggestions. Not running hot nor is trans slipping so don't think it is EGR.
Getting your hands on an EGT sensor would help, along with hooking up an A/F gauge, A faulty coolant temp sensor could cause this issue without a doubt. Even using a infrared temp gauge would help, hitting each cylinder checking outside temp could indicate a lean or rich cylinder condtion.
Posted on Sep 21, 2008
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Posted on Jan 02, 2017
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Some suggested steps for troubleshooting a P0420 error code include:
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
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