2002 Ford Taurus SEL - P1506
CEL is on in my car with code - P1506.
Following things have been done for this -
1. Intake manifold gaskets has been replaced.
2. IAC valve has been replaced.
3. All the hoses (PCV) have been replaced.
4. Throttle Body has been replaced.
5. Smoke test done for checking vacuum leaks and there are none.
RPM has come down from 1200-1300 to 900-1000 now. However the cel is on
again with same code.
What can be the issue?
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