Catalytic Converter or O2 sensors? P1152 P1131 P0155 - Ranger-Forums - The Ultimate Ford Ranger Resource
Ford Ranger Forum - Forums for Ford Ranger enthusiast!

Go Back   Ranger-Forums - The Ultimate Ford Ranger Resource Arrow Ranger-Forums Technical Engine Forum Arrow 4.0L OHV & SOHC V6 Tech

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

LinkBack Thread Tools Search this Thread
Old 04-11-2012
Thread Starter

I am: Clint McDaniel
Join Date: Apr 2012
Location: Springfield, MO
Vehicle: 2000 Ford Ranger 4.0L OHV
Posts: 9
Total Props: 0
Catalytic Converter or O2 sensors? P1152 P1131 P0155

Just bought a 2000 Ford Ranger XLT 4.0L V6 4x4, 5spd Auto, a couple of months ago...


Rough Idle - Sometimes it will have a rough idle and occasionally die. It doesn't seem to matter if the engine is cold or warmed up. This doesn't happen all the time. Sometimes it seems to be fine but eventually if left running long enough it will start to idle rough and about 30-40% of the time will die.
Loss of power - An example was right after buying the truck and driving home about 75mph it bogged down to 50mph. It also died at a few stop signs. Doing a brake test in the driveway, it will also bog down and sometimes while driving at in-town speeds you can feel it lose power and then it will pick back up and jerk back into running correctly for a bit.

It's throwing these codes:
P1152 - Lack of O2 switches - bank 2 sensor 1 - rich; ECM detected 02 sensor at its rich limit
P1131 - Lack of bank 1 02 transitions - lean; ECM detected bank 1 02 at its lean limit
P0155 - HO2S21 heater condition (Heated oxygen sensor Bank 2 Sensor 1); The powertrain control module monitors the oxygen sensor heater. The computer has recognized a failure in this circuit.

I had a local mechanic that I've known a long time and trust check it out and he thinks it's due to the CAT and not the O2 sensors or any issues with the EGR. He showed me where it looked like someone had cut a square out of the bottom of one of the CAT's (it has 2 in-line), and welded the cut-out square back. He thought they were trying to drill out the CAT to maybe make it sound louder or something.

I can't really afford to throw parts at the truck trying to figure it out. Any thoughts or help would be greatly appreciated.

Reply With Quote
+ 0 -
Old 04-11-2012
Blhde's Avatar
I am: Blhde Was here
Join Date: Oct 2005
Location: Northern IL
Vehicle: 1999 Ranger 4.0 SC XLT 4X4
Posts: 2,804
Total Props: 5
Vacuum leak, I would redo the lower/upper intake gaskets. They come in a kit with valve covers too.

That is where I would start.

After that a complete tune up. Recheck codes.

Gutting the cats will screw with the computer, and push the limits of the stock tune. Replace them as your last step, I think mangnaflow makes a replacement for 250.
Reply With Quote
+ 0 -

Similar Threads
Thread Thread Starter Forum Replies Last Post
y pipe/catalytic converter trouble Johnny Mac 2.9L & 3.0L V6 Tech 12 10-22-2008 10:22 PM
2004 V6 3.0L Edge - Going to remove most rearward catalytic converter Jp7 2.9L & 3.0L V6 Tech 15 11-30-2007 09:54 AM
Exhaust Size after the 4th Catalytic Converter zabeard 4.0L OHV & SOHC V6 Tech 31 07-18-2007 04:05 AM
catalytic converter How do you know FORZDA 2.9L & 3.0L V6 Tech 18 07-05-2007 10:08 PM
Catalytic converter seneca 2.9L & 3.0L V6 Tech 14 01-31-2006 07:57 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -6. The time now is 02:27 PM.