1999 Ford Explorer P0133 O2 Sensor

MARLIN

MEMBER
1 POST

My check engine light comes on, I hook up my scan tool it brings up, P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) I have replace the drivers side oxygen sensor on my 1999 Explorer.
After a couple of days driving the check engine light comes on and the same code comes up.
Any idea whats going on here?

Jul 9, 2006 at 1:50 PM

TAURUSWHEEL

✓Experienced Mechanic
718 POSTS

Any work done in the engine compartment before this happened??? Check all vacuum, air cleaner, maf tubing, pcv,, make sure all is in good shape,,, may have to it to dealer or good repair shop,, testing of the circuits involved and some of the info needed may be beyond the scope of the driveway mechanic,, since you've replaced the sensor and same issue has come up, possibly a circuit issue?? Have you put any fuel additives in your tank before this happened??? A rarity to be sure, but can affect certain components..

Jul 10, 2006 at 9:53 AM

Suggested Repair

Inspect vacuum lines, the air cleaner, MAF tubing, and the PCV system for leaks or damage. Because the oxygen sensor was already replaced and P0133 returned, have the sensor circuit tested by a shop. Also consider whether fuel additives were used before the problem started.

Conversation Summary

The owner of a 1999 Ford Explorer has a recurring P0133 code for a slow Bank 1 Sensor 1 oxygen-sensor response after replacing the driver's side sensor. The expert recommends checking vacuum lines, the air cleaner, MAF tubing, and PCV system, and says circuit testing may require a dealer or repair shop. Fuel additives are mentioned as a rare possible factor.

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1999 Ford Explorer P0133 O2 Sensor

Suggested Repair

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