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1992 Landcruiser new exhaust and cat, engine code 21!

I had installed a new exhaust with dual input cat to mate to down tubes and 18mm bungs welded in for new oxygen sensors. Got two Delphi after-
market sensors and one was a "left" and one a "right" and installed the left to the drivers side and the right to the passengers side. Connected the wiring and fired it up and had a check engine light immediately. Got the test to give me a code 21 and proceeded to do a reprogram of the ECU by the road test to recalibrate, did not work. Any body have any ideas on this?


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  • Toyota Ed May 11, 2010

    Delphi sensors do not work properly on Toyotas. Not enough output voltage provided to the ECM.



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SOURCE: toyota mr2 roadster 2001 engine light on code po141 oxygen sens

bank 1 will be whichever side cylinder 1 of your engine is and bank 2 will be the opposite side. It's named bank 1 and bank 2 so that no matter how the engine is laid out, bank 1 is always on the same side as cylinder 1. I cannot say whether the right hand or the left hand one will be bank 1 as I do not know where your cylinder 1 is. The garage should know

Posted on Sep 08, 2009


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Still having the same probem i have a blown 02 sensor cant find a bung r anything its n right passenger side

So you have a hole in the exhaust where bung used to be? Weld in new bung. Or do you mean you can't find the existing O2 sensor?

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Power Steering Pump R&R Chry, Dodge, PLY 1996 -2000 Mini Vans

All of the Manuals Instruct you to Remove Exhaust Cat Converter & Loosen The rest,To Gain A Large Enough Hole to Get the Pump Out' & Well Experienced Techs Know that Exhaust Nuts are DRY and Practicly WELDED ON and Easy to BREAK. To Get Around this you can Work with WET Nuts & Bolts.
1.) Remove Passenger Wheel and Plastic Gravel Gaurd
2.) Remove Tie rod End and Lower Ball Joint
3.) Remove AXEL Cotter Pin & 1 1/4 Outer Axel Nut
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5,) Remove 2 P/s Hoses 1 18mm Line Nut 1 Hose Clamp
6.) Remove 4 15mm Mounting Bolts On Pump 3 Front 1+ "L" Bracket (BACK) Then LAST the FILL Hose From Remote Resovooir.

This Gives you A VERY Large HOLE in the Center of the SUBFRAME Cradle to Pull the P/S Pumb OUT and Avoids Breaking Any Exhaust Bolts and CUTS TIME By 1 1.2 Hours.
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1 Answer

I have a 1993 Honda civic and I want yo put this DC header on I have but the o2 sensor is suppose to go on there but there's no place for one how can I do it and not have my service engine light on

As long as its in front of the cat you can drill a hole in the collector pipe and order a bung from summit or parts store then weld it in and relocate o2 sensor down low

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I replaced catalytic converter in my 2006 Pacifica and after two months check engine light came back on,code 420 bad cat.

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The engine idle ruff and i have no power when eccelarating

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Where is the oxygen sensor at and is it hard 2 get to

Most of these vehicles have 3, one on each exhaust pipe, left and right, and a third "downstream" just before the cat. converter. They screw into a "bung" (threaded nut) welded to the pipe. They kind of look like a spark plug with a wire, or 2, coming off of it that plugs into a harness near by. If you had the check engine light on the code usually tells you which one it is.

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After replacing the front pre cat/manifold assembly, if a new gasket was used on the flange where the precat mates to the exhaust pipe, make sure the bolts are tight and reset the engine codes with a scanner at a parts store. If the engine light comes on again with the same code you may have a faulty oxygen sensor.

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Log onto I believe they have Catalytic converters for your pathfinder for under $200.00, there OEM direct fit which means no cutting other then removing the old bolts.
If it is the Catalytic converter you can always buy it from on line and have a muffler shop install it like speedy or midas. Make sure you ask for stainless bolts and nuts.
Before you go through all the trouble, re check the DTC codes. Most of the time it's the O2 sensors that go bad and i question the garage charging you so much for the replacement of a catalytic converter.
Good luck and keep me posted.

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Catalytic converter

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