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error codes p0325 and p0301

 
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Old 01 Jul 2018, 09:37 pm
markeele's Avatar
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Default error codes p0325 and p0301

Recently got these codes knock sensor fault and cylimder 1 misfire. I changed plugs gapped at 40 thousandth changed knock sensor and connector fault went away for a couple of days. Now it's back same codes. The car is running fine. What could be causing this. Anyone else had this problem? Thanks in advance for any help offered
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Old 01 Jul 2018, 11:19 pm
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Default Re: error codes p0325 and p0301

P0325 - Knock Sensor Circuit Malfunction

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. The knock sensor generally threads into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly.

Possible Causes:

1. Knock Sensor connector is damaged or shorted
2. Knock Sensor signal circuit open or grounded
3. Knock Sensor signal circuit shorted to return circuit
4. Knock Sensor return circuit is open
5. Knock Sensor not tightened properly
6. Knock Sensor damaged or has failed (it may be open internally)
7. PCM has failed

I would fix the cylinder 1 misfire first and then check the wiring going to the knock sensor. Try some fuel injector cleaner that is safe for CAT.
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Last edited by ptcruisersteve; 01 Jul 2018 at 11:36 pm.
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Old 02 Jul 2018, 08:48 am
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Default Re: error codes p0325 and p0301

What kind of fuel injector cleaner do you recommend. Is any one any better than the other? And thanks for the advice
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Old 02 Jul 2018, 09:49 am
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Default Re: error codes p0325 and p0301

Is there a chance that you forgot to disconnect the battery to clear the codes???
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Old 02 Jul 2018, 12:06 pm
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Default Re: error codes p0325 and p0301

No i did that, not sure why it would come back it definitely runs better from the work i did. Im going to try the injection cleaner and see what happens with that
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