Cylinder 4 Pressure Variation Low

Check these first

• A weak cylinder 4 contributing less than the rest
• A leaking valve or ring on cylinder 4
• An injector delivering short on cylinder 4
• A failed cylinder 4 pressure sensor
• Worn cam lobes on cylinder 4

What to do next

1. Compare cylinder 4 pressure balance across the cylinders on a scan tool
2. Run a compression and leakdown test on cylinder 4
3. Test the cylinder 4 injector for flow
4. Check the cylinder 4 sensor against a known good one
5. Repair the valve, ring or injector fault if the test confirms it
6. Clear the code and retest

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