Essentially this code is relaying a fault detected by an Oxygen sensor. Bank 1 - the one in front of the Catalytic Convertor, Bank 2 - behind the Convertor. So, should you replace the sensor? NO - not yet. Should I replace the Catalytic Convertor? NO - not yet.
You must try to untangle the web of potential problems first. Usually on lower mileage vehicles an Oxygen sensor can be the culprit. On older - high mileage cars, a Convertor may likely be the source of that irritating light on your dash. Suggestions:
1 - Examine the Oxygen Sensors connections and wiring. Ensure all is well.
2 - Inspect the Sensors closely. If corroded but otherwise intact in appearence - then while they
may have set off the alarm, something else may be corroding them.
3 - Check the convertor. Determine the back/exhaust pressure levels and tolerances. A clogged or
failing convertor usually results in less back pressure and more between it and the engine.
4 - Get ready to be frustrated. You may replace both sensors and a convertor only to find it
starts all over again several thousand miles later.
5 - Point is: begin examining compnents of the engine that may cause sub-specified exhaust
gases - EGR, FI problems, valve timing, igintion timing. - the list goes on till frustraions
earlier light.
Good Luck.
Ramsey Maness -
You must try to untangle the web of potential problems first. Usually on lower mileage vehicles an Oxygen sensor can be the culprit. On older - high mileage cars, a Convertor may likely be the source of that irritating light on your dash. Suggestions:
1 - Examine the Oxygen Sensors connections and wiring. Ensure all is well.
2 - Inspect the Sensors closely. If corroded but otherwise intact in appearence - then while they
may have set off the alarm, something else may be corroding them.
3 - Check the convertor. Determine the back/exhaust pressure levels and tolerances. A clogged or
failing convertor usually results in less back pressure and more between it and the engine.
4 - Get ready to be frustrated. You may replace both sensors and a convertor only to find it
starts all over again several thousand miles later.
5 - Point is: begin examining compnents of the engine that may cause sub-specified exhaust
gases - EGR, FI problems, valve timing, igintion timing. - the list goes on till frustraions
earlier light.
Good Luck.
Ramsey Maness -
