P0345 Code

[03Merc]

Anyone have this code b4 and fixed it? I tried coil, spark plug and new coil connector. Car still running lean. Misfiring slightly.

Correction P0354 cylinder 4.





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[SilverPhoenix]

While I don't know much about fixing cars, I did a quick search and found this checklist and there also seems to be a few videos about this code on YouTube...

[FONT=&quot][COLOR=var(--m3c11)]How to troubleshoot the issue

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1. Inspect the ignition coil:
   [COLOR=var(--m3c9)]Check the ignition coil for cylinder #4 for any signs of physical damage or corrosion. [COLOR=var(--rrJJUc)][COLOR=var(--YLNNHc) !important]

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2. Check the spark plug:
   [COLOR=var(--m3c9)]A failing spark plug can also trigger this code. Inspect the spark plug for cylinder #4. [COLOR=var(--rrJJUc)][COLOR=var(--YLNNHc) !important]
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3. Inspect the wiring harness:
   [COLOR=var(--m3c9)]Examine the wiring and connectors leading to the coil for cylinder #4. Look for loose, frayed, or damaged wires. [COLOR=var(--rrJJUc)][COLOR=var(--YLNNHc) !important]
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4. Test the coil:
   [COLOR=var(--m3c9)]Use a multimeter to test the coil's resistance and ensure it is functioning correctly. [COLOR=var(--rrJJUc)][COLOR=var(--YLNNHc) !important]
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5. Repair or replace:
   [COLOR=var(--m3c9)]Based on your findings, replace the faulty ignition coil, spark plug, or repair any damaged wiring. [COLOR=var(--rrJJUc)][COLOR=var(--YLNNHc) !important]
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6. Clear the code:
   [COLOR=var(--m3c9)]After making repairs, clear the code and take the vehicle for a test drive to confirm the issue is resolved. [/COLOR]
   
   
   

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[03Merc]

I figured it out, hairline crack in the spark plug, I had a couple extra on hand. Just drove the car 700miles round trip. Will throw in fresh new plugs next oil change.

Thanks for the info! Will keep this on hand for future.


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[SilverPhoenix]

Glad I could help. Finding a hairline crack in a spark plug...I would have never thought about that being a possibility.