Thread: P0133 and P1133
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Old 03-13-2015, 11:21 AM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: P0133 and P1133

350k kms/217k miles is a long time on these two original(?) parts. A worn out catcon tends to fall apart internally, disintegrating and gradually coming off exhaust flow. This is displayed by poor engine running, inexplicable error codes, engine unable to reach speed and taking longer to accelerate. Blocked catcons are found by members removing the front pre-cat O2 sensor, allowing an immediate engine performance improvement because of the alternate exhaust path bypassing the blocked catcon. If your engine runs fine and gets up to speed, the catcon is probably find but eventually will wear out. Hopefully this is corroded wiring connections otherwise a worn out O2 sensor is likely.

Both error codes are explained in service manuals as cycling slower than normal (output cycling between 0.4v-0.8v DC) several times per second and detected by on board diagnostics monitoring emissions circuits constantly. Any change from programmed parameters not matched by sensors outputting within a range of values triggers error codes. Physical inspection of the sensor and associated wiring/connections is first followed by other checks before determining replacement. No one guarantees replacement O2 sensors beyond a set time period or mileage beyond approximately 80k kms/50k miles so it can be presumed yours, if original, has lasted well beyond a reasonable time/mileage. The exceptions are USA mandates for emissions parts to last 8 yrs/100k miles.

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