Check engine light on, codes P301, P307, P158 and P523

2003 JEEP GRAND CHEROKEE

205,000 MILES • 4.7L • V8 • 4WD • AUTOMATIC

JAKE PAMPERIN

MEMBER
1 POST

Factory trouble codes:
P301
P307
P158
P523??
Check engine light stays on.
Engine rough idle stalls now will not start.

Mar 13, 2022 at 5:28 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

The code:

P0301& P0307 -Cylinders 1 and 7 misfire.
P0158 - Oxygen sensor bank 2 sensor 2 voltage too high.
P0523 -Oil pressure voltage too high

The misfire codes can be due to bad plugs or coils, fuel pressure issue, faulty fuel pump module, bad injectors.
The oxygen sensor and the oil pressure codes could be due to wiring issues for those sensors.

I have attached the trouble shooting steps for these codes below. Follow those steps, as it can help you determine the issue.

Let me know of any questions.
Thank you.

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