OBD Codes P1313, P1314, P1316, P1318, P1319

[jporter]

I have a 98 Boxster with 84K miles. I had the CEL come on and read the codes – P1319, P1318, P1316 and a pending code for P0130. I reset the light and the codes came on the next day after about an hour of driving. This time the codes were P1319, P1314, P1313 and a pending code for P0130. I replaced the B2S1 O2 sensor a couple of years ago as this one was flat lined on the sensor plots.

I have reviewed the other threads on this issue and it seems odd to me that I would get misfires on both sides, but only show a possible issue with the B1S1 O2 sensor. The plots also look better than I recall the plot was for the B2S1 O2 sensors that I replaced in the past. I recorded the sensor values for a 20 minutes ride at a variety of speeds. I have attached the sensor plots (5 second scan rate) for your review and would appreciate any comments that could help me resolve this issue.

[Loren]

P1313 Misfire, Cylinder 1, Emission Relevant

P1314 Misfire, Cylinder 2, Emission Relevant

P1316 Misfire, Cylinder 4, Emission Relevant

P1318 Misfire, Cylinder 6, Emission Relevant

P1319 Misfire, Emission Relevant

Most likely causes:

- Fouled, faulty or incorrect

- Contact resistance

- Loose contacts

Have you changed the spark plugs recently?

Correct spark plugs?

You should check the continuity of the flywheel sensor.

Check for cracked ignition coils.

[jporter]

Thanks for the quick reply. I have not changed the spark plugs and that could be the issue. Are your comments following "Most likely causes" about the spark plugs?

[Loren]

If you are sure the spark plugs/coils are good then you need to start looking at other possible causes of the misfires.

Such as a bad flywheel sensor, or bad cam sensor.

[jporter]

I think the spark plugs could be very old as I have not changed the plugs and I have had the car for 3 years. I will search the site for the proper plugs and replace them. I will also look at the other issues you mentioned. Again thank you for the replies and the great support you provide in this forum.

[Toby]

Most likely causes:

- Fouled, faulty or incorrect

- Contact resistance

- Loose contacts

Have you changed the spark plugs recently?

Correct spark plugs?

You should check the continuity of the flywheel sensor.

Check for cracked ignition coils.

Search function worked perfectly!

My CEL was blinking and the engine shut itself off within 10 seconds. It started back up with no CEL.

My dealer read codes for misfire from 2 cylinders, and they found frayed wires in my ignition coils. I am going to change them myself and save $$$.

Thanks for setting this site up. Great resource.

Cheers,

Toby