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    HAMDAYS's Avatar
    HAMDAYS Posts: 20, Reputation: 1
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    #21

    Aug 25, 2010, 06:08 PM

    Thank you! I am going to print this out and take it to him.. ok will obviously tip the creator! ha ha I've got to go back to work Monday & this will be a pain if I can't get my car by then..
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #22

    Aug 25, 2010, 06:23 PM

    Victory is close!

    Does the CEL stay off now?
    HAMDAYS's Avatar
    HAMDAYS Posts: 20, Reputation: 1
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    #23

    Sep 2, 2010, 11:03 PM
    The continuing saga.. honda 1998 civic
    OK here's the latest... '98 civic was dying in midair.. replaced cm and coil, (in Honda housing) had just had tuneup, diagnostic was saying 02 front sensor, did testing, mechanic just replaced 02 sensor.. diagnostic now throwing a converter 420 code but converter is not clogged... adv me my car is ready.. is it??
    HAMDAYS's Avatar
    HAMDAYS Posts: 20, Reputation: 1
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    #24

    Sep 2, 2010, 11:31 PM
    Getting 420 converter code but converter not clogged?
    '98 honda civic... 02 sensor replaced, coil, cm replaced, tuneup ngk,? getting 420 code from diag...
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #25

    Sep 3, 2010, 06:30 AM

    P0420--Catalyst System Efficiency Below Threshold. It may not be blocked but it may be seriously compromised. You will likely have to replace the converter. It may be that whatever damaged the upstream oxygen sensor also impaired the converter.

    Did the mechanic install a Denso upstream oxygen sensor? I only recommend Denso oxygen sensors for Hondas. Also, ensure the wiring harness, which the pigtail connector plugs into, is good.

    Start using SAE 5W-30 full-synthetic engine oil (e.g. Mobil 1 or Pennzoil Platinum). Change oil and filter every 6,000 miles or 6 months, whichever comes first. Synthetics take much better care of your pollution control systems, prolonging the life of the oxygen sensors, catalytic converter, PCV Valve, and EGR Valve.
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