Got the codes read: P0300, P0304, P0305, P0306 - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 01-08-2007, 12:54 PM Thread Starter
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Got the codes read: P0300, P0304, P0305, P0306

My OBDII scanner arrived today and the I got the following codes:

P0300, P0304, P0305, P0306

Having elimated the following:

1. Bad gas. Pulled off the expressway and filled up when the vehicle started to have problems.
2. MAF- removed and cleaned with CRC Mass Air Flow Sensor cleaner
3. Oxygen Sensors- replaced all 4

This leaves me with the following:

4. Spark Plug wires and plugs
5. Catalytic converter. I'll assume passenger side since cylinders 4,5,and 6 misfired. (4,5,and 6 is one the passenger's side...right????)

For those of you who have had to deal with this before, could it just be the plugs and wires? If you think that it is sure to be the cat, any idea where I can buy a new one? Thanks

I have included a link to my original post so that someone else who has this problem will have less searching to do.

https://www.benzworld.org/forums/w163...ver-25mph.html

Mike
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post #2 of 31 (permalink) Old 01-08-2007, 01:17 PM
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It seems to be a clue that all of your misfires are on one side PO304-Cylinder4, PO305-Cylinder5 and PO306-Cylinder6. I would look into the possibility of an electronic problem such as the coils that the wires plug into.

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post #3 of 31 (permalink) Old 12-04-2018, 11:05 AM
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Can I have golden shovel award? Got same errors, on same 1 side cylinders + p0175 + pending p0151. Can anyone help? Maybe OP have good memory?
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post #4 of 31 (permalink) Old 12-04-2018, 11:31 AM
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Can I have golden shovel award? Got same errors, on same 1 side cylinders + p0175 + pending p0151. Can anyone help? Maybe OP have good memory?
Take a look at LTFT and STFT on both banks, compare them. Have catalytic converter checked on offending bank.
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post #5 of 31 (permalink) Old 12-04-2018, 12:35 PM
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Take a look at LTFT and STFT on both banks, compare them. Have catalytic converter checked on offending bank.
As now I'm reading forums it is maf or catalytic. Last time I sprayed MAF & repalced all plugs and car worked perfectly for 3 days.
Now I know to first spray MAF again - if it works - then replace, if not check CAT
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post #6 of 31 (permalink) Old 12-05-2018, 11:50 AM
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Take a look at LTFT and STFT on both banks, compare them. Have catalytic converter checked on offending bank.
It's a little better, but car wasn't cold since I replaced MAF - everything will be clear tomorrow. Can you please explain how can I chech LTFT and STFT with cheap BT ELM scanner, or maybe I should look for mechanic?
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post #7 of 31 (permalink) Old 12-05-2018, 12:01 PM
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I'm not sure but probably my CAT has crack on it's casing. Friend welded it, to stop the noise. Can it be clue, that CAT has broke and closed air flow?
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post #8 of 31 (permalink) Old 12-05-2018, 12:17 PM
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It's a little better, but car wasn't cold since I replaced MAF - everything will be clear tomorrow. Can you please explain how can I chech LTFT and STFT with cheap BT ELM scanner, or maybe I should look for mechanic?
What app are you using? Here is screenshot from Torque.
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post #9 of 31 (permalink) Old 12-05-2018, 10:00 PM
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Today at 10km long city ride the only error I got was p0306. I will try to set torque for LTFT and STFT when I will drive home.
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post #10 of 31 (permalink) Old 12-06-2018, 08:45 AM
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Here it goes First image is start engine on cold, all screen are made on stop (traffic lights or parking). Also now my engine is making strange high tone noises.

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