Fuel Filter changed, CEL now?

[blizz86]

Changed out the fuel filter a week ago, had a few hiccups with a flare that was messed up by PO. Repaired the line with a repair kit and no leaks.

Had a CEL come on immediately, but i thought it would clear up within a week.
Checked the codes today and its a P0125 and P1130.

I did pull the EFI fuse once, but it was pretty hard to, did i jack the fuse up? Searches seem to indicate a faulty O2 sensor but i didnt have an issue with this before. Idle, power, acceleration, everything is running fine and i have noticed an increase in mpgs...

Any input?

edit: I also cleaned the MAF sensor about 2 weeks before changing out the fuel filter.

 

[TheDurk]

That's your front exhaust sensor. They go when they go. Don't second guess it. Sensor will also fix the P0125 and probably the mpg's.

 

[blizz86]

That's your front exhaust sensor. They go when they go. Don't second guess it. Sensor will also fix the P0125 and probably the mpg's.

What do you mean by front exhaust sensor? The O2 sensor in front of the cat?

 

[JBurt]

Yeah the one in front of the cat. If you get the part number from denso you can search for it on google and get them cheaper than the dealership. I use this site:

Find My Part | DENSO Auto Parts

 

[TheDurk]

What do you mean by front exhaust sensor? The O2 sensor in front of the cat?

I don't know if you have an A/F sensor or an O2 sensor, but yeah the one in front of the cat. You have a 2000 and live in CA so probably an A/F sensor. Sounds like you need my ABC's of exhaust sensor post:

1. There are only three types of actual sensors: O2 flange (front and back), O2 screw-in(rear only), and A/F flange (front only). All other differences are wire length only. A/F's and o2's have different plugs. Wire length and specific part number varies by year, auto/manual,4wd/2wd, V6 or 4cyl, Cali./Fed. See #5 below.

2. Failing front sensors can degrade MPG's without throwing a code; if MPG's are out of whack, clean MAF and TB, then change front sensor if over 75k, change plugs if over 30k, change air filter if it needs it (visual).

3. All '96-'98 4Runners had the one-cat system. Cali'. systems with A/F sensors in front and two cats existed only in '99 and '00 and were sold all over the country, especially in 2000. Where the truck was sold means nothing except all trucks sold in Cali. were Cali.s in '99 and '00. Then, all trucks sold from 2001 on had the "Cali." two-cat system that then became the Federal 50-state standard.

4. To tell if you have a Cali., count cats or look at emissions sticker. Look at top left under ENGINE FAMILY: if it says ...AF, TWC(2), HO2S....it's a Cali. If it says ...TWC, HO2S(2).... : it's a one-cat, '96-'00 Federal.

5. Use Denso or Toyota sensors (made by Denso) only. You will pay a lot more for the exact same thing from Toyota. Get your Denso part number here:http://www.densoautoparts.com/find-my-part/vehicle-selectionThen buy on Amazon, rockauto, partsgeek or wherever you find it cheapest.

6. In salty states, the nuts will rust away and have to be replaced. They are stainless steel M8-1.25 nuts, part #90179-08059 at the dealer. Two per sensor. Denso/Toyota sensors come with the gasket included.

 

[blizz86]

Yeah the one in front of the cat. If you get the part number from denso you can search for it on google and get them cheaper than the dealership. I use this site:

Find My Part | DENSO Auto Parts

Thanks, seems i need the 234-9002 a/f sensor.. 104 on amazon :l better than 18x i guess. lol

I''ll update in a week.

 

[blizz86]

Replaced with denose part # 234-9002. No more CEL. Took all of 15 minutes.