Drive with caution — fix soon.
This code means the main catalytic converter on bank 1 has dropped below its required efficiency, based on the oxygen sensors before and after it. While a worn-out catalyst is a common cause, it can also stem from a faulty oxygen sensor, an exhaust leak, or an engine condition like a misfire. Repairs range from sensor replacement to replacing the main catalytic converter.
$250 – $1800
Varies by vehicle and root cause.
Usually yes, at least short-term. The car typically runs normally, but emissions are higher and it will fail a smog test. Get it diagnosed soon so a minor cause doesn't turn into a major converter replacement.
It ranges widely, from about $250 for a sensor or exhaust-leak fix to $1,800 or more if the main catalytic converter needs replacement, which is the priciest scenario.
It's moderate severity. It won't strand you right away, but it points to an emissions problem, and if the cause is a misfire or rich mixture it can keep damaging the catalyst.
It refers to the primary catalytic converter on bank 1, the larger converter that does most of the emissions cleanup, as opposed to a smaller warm-up catalyst nearer the engine.