Question about 2003 Ford Ranger Regular Cab

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Can i remove the last set of cats on my 2003 ranger and replace it with an exhaust pipe with an o2 sensor hole in it?

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Your engine light will come one with a p0420 code for catalytic efficiency if you replace it with a straight pipe before the rear oxygen sensor

Posted on Sep 08, 2009

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My 2003 ranger 2.3 is idoling rough and sounds like its backfiring in side the engine seems to run fine when i accelerate


Could be that your cat is clogged up,the way to check is to remove and look in both ends,mine clogged up and caused my head gasket to blow between cylinder 3 and 4 on my 85 Nissan 720,part of the inside came apart and was blocking the air flow,causing my exhaust plugs to blister.

Feb 19, 2015 | 2003 Ford Ranger Regular Cab

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I have a 2005 Mitsubishi Lancer estate tha has the engine management light on but doesn't seem to affect drive/performance of car what cud this be as I had diagnostic an they say something to do with the...


Trying to make sense of the question: the diagnosticians seem to be saying there''s an obstruction or leakage or something amiss in the exhaust system, quite likely related to the catalytic coverter(s). The main electrical signal involving exhaust (manifold) and cat and ECU (computer) would be the O2 sensor or heated O2 sensor. A "confused" signal from O2 sensor to ECU could cause it to signal a Check Engine message--perhaps a sluggish O2 sensor. That sensor generally controls EGR (exhaust gas recurculation) fuel return to fuel intake, and could be malfunctioning without obvious performance degradation. Since your "engine management" message seem to be suggesting an emissions control fault, the items referred to above seem like likely candidates as the problem. It should not be ignored even with driver acceptable, nominal engine performance because exhaust gas recirculation (EGR) control is also associated with fuel mixture control...which, if not corrected, shows up as too high nitrogen oxides out the tail pipe; and otherwise as rapid destuction of the expensive catalyitic converter(s).
Depending on how long since last O2 sensor replacement (say, over 5 years to never) DIY changing to that sensor could prove a cheap way to clear the problem. Even if not, you now have an assured sensor without spending too much or more than you will eventually spend anyway. The rest of the problem is generally not owner servicable.

Oct 28, 2014 | Cars & Trucks

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What can i do to solve problem code p0420 on the car.


This code can be a pain... unfortunately P0420 means it could be several things. Depending on how old the car is...
- Check for exhaust leaks in all pipes and exhaust manifold (visual inspection, listen for that ******* noise evident of holes)
- Get an O2 sensor socket, remove the sensors and inspect. Peer inside the catalytic converter from top and bottom, look for clean horizontal honey comb pattern. Should be obvious if pieces are falling out. Look at O2 sensors for corrosion or fading of metal, they only last ~100K. Only the upstream sensor affects how the car drives though, the bottom one just measures how good the cat is doing. Either one can trip the check engine light though.
* Symptoms of driving performance may take awhile to develop, and either a bad sensor or bad cat can cause it to run rich and burn excess fuel. Running long times with a bad upstream sensor can lead to damage on the cat, so do the cheap O2 sensor replacement first.
[My 1998 civic had the light on since I got it in May, finally performance and fuel economy started dropping. Before buying an O2 sensor or new cat, I visually inspected everything and finally took the sensors out to look at them and inside the cat. The cat and bottom sensor looked okay, but the top was corroded (I figured it was the top since my driving was being affected). I replaced the top O2 sensor and she runs nicely now, I expect fuel economy to return. You can clean sensors sometimes (no water), but usually its corroded so just replace it. $70 for a sensor is WAY cheaper than paying someone to replace you cat, which is a recommended change if you end up having to get a new cat anyway (don't want to ruin a new cat with a bad sensor dumping fuel in).

Sep 08, 2012 | 2003 Pontiac Vibe

3 Answers

Catalytic converter needs replaced, want to do it myself but need a set of instructions or a manual. thought i could find one on the internet but not having any luck.


Visit your local library and take a look at their motor manual collection for general instructions for this procedure.

Mar 03, 2011 | 2003 Toyota Highlander

2 Answers

2003 Nissan Murano SL AWD-engine light is on...had diagnosic test completed and they say I need Oz Sensor. How or where is I get the part number for this?


hi karen,to locate the o2 (lambda probe)sensor, locate the exhaust manifold (its HOT)and follow the pipe down to the first box,(cat).you will find a 2" small "pipe" at right angles to the exhaust pipe with a wire (or 2) emanating from the top.this IS the o2 sensor.(sometimes fitted onto the front of the cat.depending on market(im in England) you only need to remove this sensor and replace it with a new one.(you can do this yourself,its easy.)

Nov 09, 2010 | 2003 Nissan Murano

1 Answer

I would like to know where the oxigen sensors are located and how many does my 2003 lincoln navigator has?


the oxygen sensors are located in the exhaust pipe. There will be at least three and possible four. The upstream sensors are always located before the catalytic converter and usually close to where the exhaust pipe bolts to the exhaust manifold. The job of these two sensors is to monitor the difference in oxygen values between the outside air and the exhaust to help determine proper air fuel ratios.

If you have a single catalytic converter than there will be one O2 sensor (downstream) located after the catalytic converter. If there are two cats than there could be two O2 sensors behind each cat. The job of these two sensors is to monitor the catalytic converters efficiency.

Oct 25, 2010 | 2003 Lincoln Navigator

1 Answer

How many o2 sensers are there on a 2003 ford taurus with the 3 liter dohc v-6


2 O2 sensors and 2 catalytic converter efficiency monitors, they look like O2 sensors but are not, they are after the cat converters, the O2's are before the cat converters in the exhaust pipe of the engine exhaust manifolds

Sep 23, 2010 | 2003 Ford Taurus

2 Answers

I have a 2003 Nissan Sentra SE-R Spec V. o2 sensor location?!?1


theres always one on the intake manifold working its way down to catalytic convertor is the oxygen sensor 1 heater circuit(pre cat conv) signal while terminal #25 is oxygen sensor 2 heater circuit (post cat conv)

Feb 12, 2010 | Nissan Sentra Cars & Trucks

3 Answers

Help with toyota corolla 2003 code P0420. Went to Autozone for check engine light help and they discovered BBCatalyst system efficiancy below threshhold-bank 1 Probable cause BB1. air leak in exhaust...


CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.

Aug 30, 2009 | 2003 Toyota Corolla

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