#carbon
4 posts in Car Diagnostics blog about "carbon" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P2004 to P2010: intake manifold runner control stuck and circuit faults
Flaps inside the intake manifold change how air swirls into the cylinder. On a diesel they seize with carbon, and the failure has a mechanical worst case worth knowing.
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P2119: throttle actuator control throttle body range/performance
The throttle plate did not return to where the ECU expects it to rest. Nine times out of ten that is carbon, and the fix has a mandatory second step.
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P0400 and P0403: EGR flow malfunction and control circuit
P0400 says the exhaust gas is not flowing. P0403 says the valve is not being commanded properly. One is usually carbon; the other is usually electrical.
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P0404: EGR position sensor range/performance explained
P0404 compares commanded EGR position against measured position. Carbon, not electronics, is behind most of them — and cleaning beats replacing far more often than parts sellers admit.