so i had the p0136 code for a while and 3 months ago i replaced the downstream o2 sensor and then reset the code. a month later i had the same code and have ignored it since. then i recently got a p0171 and that code has come on and off and dont know what it could be. my truck runs fine and doesnt have a rough idle or stalling problems. i need help with this one because i dont want to go out and waste money on parts and then those parts dont fix the problem. and i cant pass smog either.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

http://www.obd-codes.com/p0136
http://www.obd-codes.com/p0171

seems to point to a bad O2 sensor on bank 1 or passenger side

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Truck: 2000 Ford Ranger XLT 4.0 4x4 ext cab
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Here's some "no cost" things you can try first,

Clean the MAF sensor and see if that gets rid of the p0171 code,

Next clean the connectors for the downstream o2 sensor and see if that brings the voltage up. Now keep in mind that the O2 sensor after the CAT is only a monitor of what it's doing, it's has nothing to do with fuel trims...The voltage of the downstream O2 should be real close to .5 volts and no wide swings....if the voltage does fluctuate, then your CAT is on it's way out..

Your lucky you have a Ultra gage so you can read live data, this going to help you alot !!

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2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.

I think my problem with my truck is my catalytic converter because earlier this year I had a misfire on cylinder 3 and I drove about 25 miles with a bad coil and I read that having a misfire will damage the cat

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

i would hope not cats are expensive

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Truck: 2000 Ford Ranger XLT 4.0 4x4 ext cab
My Build Thread
Mod Ideas
Don't Forget to:
Create a Signature
Show your system

Mods: Brush guard|Front Hitch|Expo Roof Rack|Train Horn|Door/Dash/step/Hood Leds|2" lift|Rear Tow Points|On-Board Air System| 22" & 40" LED bar|and More!

A high flow magnaflow cat for my truck is $106 from summit racing.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

found out what the problem was. It was a hose going into the intake that had cracks and hold it. also the Bosch o2 sensor that I put in there was the piece of shit and it was causing it my run lean code, so they threw a Motorcraft in there. Trusting Motorcraft product from now on

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

you want in on fresno round 3?

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http://treadlightly.org/quick-tips-f...four-wheeling/

actually yes i would morgan. and i would like to apologize for my actions that i directed towards you 6 months ago. i didnt mean to ruin your life at all, my bad. but it does seem like your doing well and your slut is looking better than ever.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.