What do you feel? The engine exhibits a slight hesitation when accelerating, as if it takes a “thought” moment before responding. At idle, you feel the car vibrate a little more than usual. Fuel consumption increases, which seems contradictory, since the error message indicates “low fuel”.
The Logic of the System: Think of the engine like someone trying to drink juice through a straw. The P0171 code means the straw has a hole. Air gets in where it shouldn’t (false air intake), and the car’s control unit panics. It detects too much oxygen and tries to compensate by pumping in more gasoline than necessary. That’s why the “lean mixture” error ironically makes your wallet suffer with high fuel consumption.
- Where to investigate: The problem is almost always a dried-out vacuum hose or the intake manifold seals. If your car has a 1.6 16V engine, check the… Valve Cover Membrane. If it tears, the engine “sucks” air directly into it, messing up the entire combustion process.
- The Simple Test: With the engine running, if you hear a constant whistling sound coming from under the hood, you’ve found the air leak that’s generating the code.
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