P0068: the airflow reading and the throttle position disagree
The engine control unit checks the air it thinks is entering the engine, measured by the airflow or manifold pressure sensor, against how far the throttle (the valve that controls how much air can get in) is actually open. This code means those two readings don't agree with each other by as much as the computer allows. It's a comparison fault between two sensors, not a statement that either one has failed.
You might notice
- The engine warning light comes on
- The engine may feel hesitant or down on power
- throttle
- — the valve that controls how much air can get into the engine
- manifold pressure sensor
- — a sensor that measures the pressure inside the intake manifold
What the code itself says
P0068 is a powertrain (engine, gearbox and drive system) code, and the 0 after the letter means it is a generic code with a standard meaning.
Grouped here as: Engine running, fuelling and misfires — Air metering, fuelling, ignition, misfire, idle, boost, knock, oxygen sensors and the catalyst, all working together in the running engine. That grouping is ours, to help explain the code. The code's official family is the letter at the start.
This page is generic. Your car isn't.
A code on its own only tells you what the sensor saw, not what's actually wrong — and that changes next to your other codes. Read this one together with the rest of your scan and we'll work out what's really going on.
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