The range sensor tells the car which gear you selected. When it fails, the symptoms range from a reverse light that never works to an engine that will start in Drive.
The turbine speed sensor is how the gearbox knows what the torque converter is doing. Lose it and shift quality collapses, but the cause is often a magnet covered in swarf rather than a failed sensor.
P0730 means the gearbox commanded a gear and measured a different ratio. Whether that is mechanical slip or a bad speed signal decides between a fluid service and a rebuild.
The converter clutch is what turns a slushbox into a direct drive at cruise. When it stops locking, fuel consumption rises, the gearbox runs hot and these two codes appear.
Shift solenoid codes name a letter, not a gear. Understanding what each solenoid controls and why they stick turns a scary transmission code into a manageable repair.
P1000 is not a fault at all. It means the self-tests have not finished since the last code clear, and it is the most common reason a perfectly healthy car fails an emissions test.
One code says the filter is not filtering, the other says it is too full. Both usually trace back to regeneration that keeps starting and never finishes.
These codes come from the downstream sensor asking the ECU to correct the mixture. They are frequently mistaken for catalyst failure when the real cause is an exhaust leak.
A lean condition that exists at idle and vanishes under load points almost exclusively at unmetered air. The load-dependence is the diagnosis, and it costs nothing to observe.
The downstream sensor should sit steady but still respond when the mixture is forced. These codes mean it stopped responding at all, and an exhaust leak imitates the symptom perfectly.
Three EV brands built after generic OBD-II stopped being relevant. What that means for owners, and which readings still repay attention on any electric car.
Electric and hydraulic systems fail in completely different ways and give completely different warnings. Knowing which one you have decides whether this is a fluid check or a scan.