Code P0300, P0301 and P0304, without symptoms?

KOT337

MEMBER
2015 VOLVO S60
2.0L
4 CYL
TURBO
2WD
AUTOMATIC
160,000 MILES

Volvo S60 2015 T5 Drive-E FWD 245KM tuned by Polestar has been getting the abovementioned codes for 2 weeks now. No issues seem to occur; the engine seems to function fine. Since the codes appeared, I fixed a P0442 code by replacing the fuel cap. Additionally, a crankshaft position sensor code was fixed by cleaning the upper one. Also swapped the spark plugs for new ones. I swapped around the coils and the cylinders 1 and 4 code keeps reappearing.

6 Replies

KOT337

MEMBER
4 POSTS

A local mechanic checked out the vehicle and saw that the engine timing system belt was cracked and old; he then ran the engine and quickly heard that during the startup it behaves a little rough, after which he decided that the engine timing system is due for replacement. This is to be done over the weekend, and we will see if this solves the codes.

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Tuesday, October 1st, 2024 AT 2:33 AM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

Did these codes come up after the tune up, if so, which spark plugs did they install? They must be the OEM spark plugs or you will have this problem. Here are the spark plugs that must be installed and the gap must be correct as well.

Gap: 0.028-0.032 inches (usually preset but should be checked).
Type: Iridium or Platinum-tipped.

OEM Part Number: Volvo recommends using genuine parts or high-quality equivalents like NGK or Denso.

Also, did you clear the codes once you changed out the ignition coil, BTW I would change out all of the ignition coils with the tune up which is an industry standard.

P0300 - Random/Multiple Cylinder Misfire Detected:
P0301 - Cylinder 1 Misfire Detected:
P0304 - Cylinder 4 Misfire Detected

Please go over this guide as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Check out the images (below). Please let us know what happens.

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