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Check Engine Light after DIY Oil Change on 2020 RX 350 - P0011/P0012

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Mike T. · rep 0 · May 25, 3:29 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus RX 350 F Sport

Hey everyone,

I just did my first oil change on my 2020 Lexus RX 350 F Sport, and now the check engine light is on. I used the recommended synthetic 0W-20 oil and a genuine Lexus oil filter, but about 50 miles later, the light popped up. I scanned it and got codes P0011 and P0012, which seem to be related to the VVT system.

I double-checked the oil level, and it's right where it should be. The oil filter cap is tight. Could I have done something wrong? Is it possible the oil filter wasn't seated correctly, or could it be something more serious? Any advice for a DIYer would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:29 AM

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ClearTheCode admin answer:

It's frustrating when a routine maintenance task leads to a check engine light! Codes P0011 (Intake Camshaft Position Timing - Over-Advanced) and P0012 (Intake Camshaft Position Timing - Over-Retarded) often point to issues with oil pressure or flow to the VVT-i system.

Here's a breakdown and what to check:

  1. Re-check Oil Filter Installation: Even with a genuine filter, improper seating can cause issues. Ensure the old O-rings were removed from the filter housing cap and that the new ones are correctly installed. A common mistake is leaving an old O-ring behind, leading to a poor seal and oil pressure drop. Also, confirm the filter element itself is correctly seated within the housing.
  2. Verify Oil Viscosity and Type: While you mentioned using 0W-20, ensure it's a high-quality synthetic oil meeting Lexus specifications. Incorrect viscosity can affect VVT-i operation, especially in colder temperatures.
  3. Inspect VVT-i Solenoids: The VVT-i solenoids (Oil Control Valves) regulate oil flow to the camshaft phasers. Sometimes, debris from an oil change (though rare with a good filter) can clog them, or they can simply fail. You can often test these by checking their resistance or applying 12V to see if they click (though this is best done by a professional).
  4. Clear Codes and Monitor: After re-checking everything, clear the codes with your scanner. Drive the vehicle normally and see if the codes return. If they reappear quickly, it suggests a persistent issue.

When to See a Shop: If the codes persist after verifying the oil filter and oil, or if you notice any performance issues like rough idle, reduced power, or increased fuel consumption, it's time to visit a qualified Lexus technician. They have specialized diagnostic tools to check oil pressure, VVT-i solenoid function, and cam phaser operation more thoroughly. Ignoring these codes can lead to further engine damage over time.

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