Drivable short-term, but fix now to avoid damage.
This code means the computer detected a low voltage signal in the wiring or control circuit for the fuel injector on cylinder 4. It usually points to a wiring fault, a short to ground, a bad connector, or a failing injector. It's often fixable by repairing the wiring or replacing the injector so that cylinder gets the correct amount of fuel.
$150 – $500
Varies by vehicle and root cause.
For short trips, usually yes, but don't rely on it. A misfiring cylinder can damage your catalytic converter and leave you stranded, so get it diagnosed quickly. If the engine shakes hard or the light flashes, stop driving and have it towed.
Repairs typically run between $150 and $500. A wiring or connector fix is on the lower end, while replacing the fuel injector pushes the cost higher once labor is included.
It can be. The cylinder isn't getting fuel correctly, which causes misfires and can harm the catalytic converter over time. It's not usually an emergency, but it shouldn't be left alone for long.
Both involve the cylinder 4 injector circuit. P0271 means the computer saw a low voltage (circuit low) condition, while P0272 means it saw a high voltage condition. They often share the same root causes, like wiring or injector faults.