O2 sensors or cats

• The PCM determines that the oxygen storage capability of the TWC has degraded to less than a calibrated threshold.
• This diagnostic may conclude in only one test attempt. However this diagnostic may require as many as 18 test attempts, which would require 3 ignition cycles. Each test attempt occurs within 1.5 minutes .

• The catalyst test may abort due to a change in the engine load. Do not change the engine load, ensure the AC is OFF, the coolant fan is not cycling, while a catalyst test is in progress.
• Driving the vehicle under the conditions outlined in the Inspection/Maintenance (I/M) section can verify whether the fault is present.
• These conditions may cause a catalytic converter to degrade. Inspect for the following conditions:
• An engine misfire
• High engine oil or high coolant consumption
• Retarded spark timing
• A weak or poor spark
• A lean fuel mixture
• A rich fuel mixture
• A damaged oxygen sensor or wiring harness
• If an intermittent condition cannot be duplicated, the information included in Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC was set.
• The catalyst may have been temporarily contaminated with a chemical from a fuel additive, fuel contamination, or any of the above conditions.

ZGHOE05 said:

Well damn lol it could be anything then basically, not to sound like a dick . I did have a bad crankshaft position sensor prior to all this and it ran awful , knocking and barely running ,im thinking that extra fuel and horrible running conditions caused the cats to get contaminated, long story short it looks like im gonna see about changing them asap

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