P2101 and P2110: throttle actuator control motor range and forced limited RPM
P2110 is not a fault in itself — it is the ECU announcing it has capped your engine speed. The fault that caused it is somewhere else in the list.
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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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P2122 and P2123: accelerator pedal position sensor D circuit
The fault is at the pedal, not at the engine. That single distinction saves people from cleaning a throttle body that was never the problem.
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P2135 and P2138: throttle and pedal sensor correlation faults
Two codes that tell you exactly which end of the drive-by-wire system to look at. Reading them correctly is the difference between a pedal and a throttle body.
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P2146 to P2149: injector group supply voltage circuit
Injectors are fed in groups. A supply fault takes out several cylinders at once, which looks like a catastrophic engine problem and usually is not.
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P2176: throttle actuator idle position not learned after cleaning
The code that appears after a job that should have gone well. Cleaning the throttle body moved the physical zero and nobody told the ECU.
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P2178 and P2180: system too rich off idle
A rich condition that appears once you are off idle points somewhere different from one that is present all the time. The load dependency is the diagnosis.
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P2191 and P2192: system too lean and too rich at higher load
Mixture errors that only appear under load are the ones that hide from an idle test. On a turbocharged engine they usually point at boost, not fuel.
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P2195 and P2197: oxygen sensor signal biased or stuck lean
The sensor is not out of range and not dead. It is simply not moving the way a working sensor moves, and the ECU has noticed the difference.
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P2200 to P2204: NOx sensor circuit on a modern diesel
The most expensive sensor on a modern diesel, and the one that stops AdBlue dosing when it fails. Neither of those facts is obvious from the code.
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P2237 to P2240: wideband oxygen sensor pump current circuit
Wideband sensors work differently from the switching sensors most guides describe, and testing them the old way gives an answer that looks alarming and means nothing.
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P2279: intake air system leak — the code that names the fault
Most codes describe a symptom and leave you to find the cause. This one states the cause outright, which makes the search unusually direct.
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