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hi scotty 2000 civic lx misfires

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I recently plugged in the scanner and got two codes pulled out. the first 1 p0303 mis firing cyl no. 3 I checked the wires everything seems good. the second code p1399 which can be several things according to the  info I gathered. any suggestions or where do I start. please help me out im low income  n the last thing I want is spending on parts that aren't the issue 

2 Answers
1

For P0303, did you try moving the spark plug/coil to another cylinder and see if the code “follows”?

Also, see our misfire sticky:

https://carkiller.com/scottykilmer/qa/misfire-4/

And:

https://www.obd-codes.com/p0303

0

For P1399 see below:  but tackle the P0303 code first.

https://www.autocodes.com/p1399_honda.html

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