2002 Hyundai Elantra GT OBD code P1166 and code P0133 (automatic transmission)


Asked by Jul 26, 2014 at 06:43 AM about the 2002 Hyundai Elantra GT Hatchback FWD

Question type: Maintenance & Repair

Someone on this site had a similar problem with no resolution.  I have changed the upstream oxygen sensor 4 times...two with aftermarket and two with parts from the dealer.  I have changed the downstream oxygen sensor 3 times.  I have also replaced the catalytic convertors and evaporator canister.  This code keeps coming on so I can't get the car inspected.  NOW, the dealer says the problem is bc I replaced most of these parts with aftermarket parts with my mechanic.  They said that they have to replace ALL those new parts with OEM parts AS A START then, see if it needs anything else...for a price of $2700.  What a scam!!!  I need help to figure out what is wrong with my car.

10 Answers

http://engine-codes.com/p1166_hyundai.html if you read that page you will see there is probably nothing wrong with the o2 sensor it's self, but caused by lack of oil change, too much oil, other things are listed.

6 of 6 people found this helpful.

http://www.obd-codes.com/p0133 ..now THAT is 02 sensor and has NOTHING to do with transmission...look at that page ...I would have copied/pasted the specifics but it's copyrighted and they politely but very firmly ask to not do that and re-direct you as I did

3 of 3 people found this helpful.

Beat me to it fordnut. Lol. Check out those links he provided. There you will find possible causes and solutions for your issues.

2 of 2 people found this helpful.

Hey, for once! Gotta get up pretty early in the morning, literally and metaphor, Good morning D

1 of 1 people found this helpful.

Why would the two codes be together?? I don't know why the Hyundai dealer refuses to properly diagnose it until I replace all the aftermarket parts. I called Hyundai themselves to question the validity of the dealership's claim to replace those NEW non-OEM parts but, they backed their dealership's advice 100%. It leaves a bad taste in my mouth about Hyundai after owning one for 12 years


http://www.2carpros.com/questions/2003-hyundai-elantra-cel-code- p1166 -- check this out. There is a list of things to check here. Also both have to do with same bank and fuel ratio issues. Check for vacuum leaks, exhaust manifold leaks, maf cleaning, ect.

2 of 2 people found this helpful.

@dandyoun Are you sure of the link? It says page not found


Yes sorry iPad issue tonight. Delete the space between (code- p). Should be (code-p) for address to work.

1 of 1 people found this helpful.

Had a similar issue w/ my '02 Elantra. Check Engine light had been on for a while, was told it had to do w/ oxygen sensors. Most recently the car would stall, idle at very low RPMs, and did not have much power and would sputter through turns. End result was only a clogged fuel valve, and that seems to have done the trick. A lot of these issues posted regarding older Hyundai Elantras seem to all relate back to the fuel source...good luck...

1 of 1 people found this helpful.

Where is the fuel valve located? Can I change it myself?

10 of 10 people found this helpful.

Your Answer


Looking for a Used Elantra in your area?

CarGurus has 45,277 nationwide Elantra listings starting at $495.


Hyundai Elantra Experts

  • #1
  • #2
    Carrie Shelton
  • #3
View All

Related Models For Sale

Used Hyundai Sonata
383 Great Deals out of 50,845 listings starting at $1,300
Used Honda Civic
391 Great Deals out of 52,297 listings starting at $1,200
Used Toyota Corolla
703 Great Deals out of 67,254 listings starting at $1,599
Used Honda Accord
565 Great Deals out of 92,859 listings starting at $1,495
Used Toyota Camry
853 Great Deals out of 72,897 listings starting at $1,400
Used Hyundai Accent
213 Great Deals out of 11,722 listings starting at $999
Used Nissan Altima
816 Great Deals out of 68,083 listings starting at $750
Used Kia Optima
367 Great Deals out of 29,619 listings starting at $1,950
Used Ford Focus
400 Great Deals out of 70,443 listings starting at $999
Used Nissan Sentra
520 Great Deals out of 50,870 listings starting at $1,995

Used Cars For Sale

2018 Hyundai Elantra For Sale
4 Great Deals out of 26,577 listings starting at $11,160
2017 Hyundai Elantra For Sale
119 Great Deals out of 6,538 listings starting at $8,495
2016 Hyundai Elantra For Sale
39 Great Deals out of 2,423 listings starting at $6,987
2015 Hyundai Elantra For Sale
100 Great Deals out of 3,231 listings starting at $7,000
2014 Hyundai Elantra For Sale
50 Great Deals out of 1,307 listings starting at $5,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.