Quote:
Originally Posted by Clodfobble
Yeah, assuming that it really truly is a failing emissions level triggering the light, and not a poor gas mixture like Lamplighter suggested.
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The combination of codes imply a least expensive suspect. To say more requires information you cannot obtain.
Appreciate what you have and what is relevant. Oxygen sensors do nothing until the engine heats them to maybe 600 degrees. During a warm up period, the engine dumps larger amounts of gasoline into the engine. Much unburned gas is then burned by the catalytic converter when it gets hot.
Once the oxygen sensors get warm, then the engine computer changes a fuel input. Leans out the mixture based, in part, on data from an oxygen sensor.
Apparently you have two sensors. If one is proving bad data, then the engine will dump improper amounts of fuel into the engine. This can result either in a too lean mixture (causing exhaust valve failure) or too rich (causing catalytic converter failure).
A most likely suspect is a bad oxygen sensor. Fix it now to avert damage that may cost $thousands.
Bad gasoline causing this problem would be noted by mileage changes approaching maybe ten percent. Of the maybe 100 other possible errors associate with the converter, gasoline might only explain less than ten.
This failure could be something as simple as an oxygen sensor with a failed heater. Then the engine computer, after a delay, would be expecting data that was incorrect. Or it could be a thermal junction failure inside that sensor. Either way, a $100+ sensor is a least expensive solution. I believe you have two. Don't know if the shop will want to replace both or just one.
Again, your reply is only as useful as facts first provided. You (typically) cannot obtain numbers necessary for a better answer. The shop can.