Sensor Code EO 133

CONNIE RAY

MEMBER
2002 SATURN SL2
4 CYL
2WD
117,000 MILES

Service Engine Soon light came on yesterday. Car taken to auto parts store. Sensor provided + Code EO 133 came up. Told it was 1 of 2 different types of O2 Sensors, w/ prices of about $20 or $85.

BF claims the auto parts store wouldn't tell him which 02 Sensor part was needed to buy or where that sensor was located. That part of his story sounds nutters. "Auto parts store won't sell auto part or put part on order if not in stock"

Do you know which 02 sensor is needed + where that 02 sensor is located? Thanks!

6 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Hi Connie Ray,

Attached are the procedures for replacing o2 1. Looks like this code is basically saying that the sensor is contaminated. Either the the wiring is corroded or the sensor itself is contaminated with oil or soot.

Let me know if you need anything else. Thanks

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Sunday, June 2nd, 2019 AT 12:56 PM

CONNIE RAY

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4 POSTS

Thank you for your time, expertise, and answer KaseKenny1.

Do you know approximately how much each of these two possible causes cost to fix along with replacing the O2 sensor in/around zip code 93307?

What would possibly cause the Service Engine Soon light to go off?

Thank you so much!

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Monday, June 3rd, 2019 AT 12:39 AM

KASEKENNY

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18,907 POSTS

Looks like the o2 sensor 1 or the upstream ranges from $15.00 to $40.00. The downstream or o2 sensor 2 is about the same.

The labor to do both is about an hour plus they would charge some diagnostic charge. Depending on their door rate in CA I would expect this to be around $150.00 assuming the door rate is around $100.00 per hour.

Yes. If one of these sensors has failed it would turn the check engine light on.

Please let me know if you need anything else. Thanks

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Monday, June 3rd, 2019 AT 4:04 PM

CONNIE RAY

MEMBER
4 POSTS

Thank you so much for your helpful time plus more information. I'm so glad you're online plus available and willing to help people by answering questions. (I do the same, but with different professional subject matter.)

The light has gone off for now. It'd be great if that meant the underlying cause has gone away. My boy friend thinks by gunning the engine and driving fast that he's "cleared" or cleaned out the 02 sensor. What do you think, please? Thank you.

Kind regards,

Connie

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Wednesday, June 5th, 2019 AT 6:09 PM

KASEKENNY

MECHANIC
18,907 POSTS

I have not seen an o2 sensor clean itself out but anything is possible. I think more than likely the additional heat may have caused some of the carbon to break loose. So I guess in a way, he may be correct.

Thank you for the kind words. Please let me know if you have more questions. Thanks