Question about 1998 Ford Explorer

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1998 Ford Explorer XLT sevice engine light came on 2days ago catalyst efficiency low bank 2 on autozone code reader but everything is running great gas milage going down hill. need to know what could cause this. If its the catalytic converter what could cause it to go bad.

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Its 11 yrs old.. Thats a lotta carbon build up in the converter.. Its time for it to go bad.. The converter is basically an exaust filter.. so its probably fully contaminated..Get it replaced and you'll get better exaust flow and better gas mileage.. Thanx

Posted on Mar 12, 2009

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1996 taurus p420 code


The P0420 means Catalyst System Efficiency Below Threshold (Bank 1), and the P0430 means Catalyst System Efficiency Below Threshold (Bank 2).
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Sep 17, 2012 | 1996 Ford Taurus

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Truck is showing code p0430 its a 1998 ford explorer


Nice SUV, I have one '97 XLT... well P0430 - Catalyst System Efficiency Below Threshold (Bank 2) means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

A code P0430 may mean that one or more of the following has happened:
- The catalytic converter is no longer functioning properly
- An oxygen sensor is not reading (functioning) properly
- There is an exhaust leak

About the possible solutions, first, inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Hope this helps; if need additional details, fell free to contac us. Good luck.

Oct 05, 2011 | 1998 Ford Explorer

3 Answers

Engine light is on, flashes when driving above 100 Km


stop by local parts store (Autozone,Advance, etc) and have them do a free fault code test. They can print out a list of faults and clear the codes

Jan 02, 2011 | 1998 Ford Explorer

2 Answers

Hi, I need to take my 2001 Mazda 626 4cyln for SMOG check in CA. But its check engine light is on, diagnosed as code P0421. Appreciate your help to fix this problem, or just to pass the check. Thank you.


CODE P0421. DEFINITION-CATALYST EFFICIENCY LOW-BANK 1. EXPLANATION-THE OXYGEN SENSORS MONITOR THE CATALYTIC CONVERTERS ABILITY TO STORE OXYGEN. PROBLEM CAUSES- 1. CATALYTIC CONVERTER DEFECTIVE (FAILURE POSSIBLY DUE TO #2,3, OR 4) 2. ENGINE MISFIRE OR RUNNING CONDITION. 3. LARGE VACCUM LEAK 4. ENGINE OIL LEAKAGE INTO EXHAUST-VALVE GUIDE SEALS, PISTON RINGS. THE PCM HAS DETERMINED THAT THE WARM UP CATALYST EFFICIENCY FOR BANK 1 IS BELOW TRESHOLD FOR THE CURRENT ENGINE OPERATING CONDITION. (BANK 1 IDENTIFIES THE LOCATION OF CYLINDER #1, WHILE BANK 2 IDENTIFIES THE CYLINDERS ON THE OPPOSITE BANK).

replace O2 sensors, or your Catalytic Converter.

Oct 06, 2010 | Mazda 626 Cars & Trucks

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My engine light came on. i had an OBD2 scan done and the code P0430 popped up. it's nthe catalyst system low efficiency bank 2. on the way home tonight my truck started shaking and vibrating a little at...


The low efficiency bank 2 means that the material inside the catalytic converter is deteriorating and needs to be replaced. FYI. Bank 2 refers to the side of the motor with cylinder number 2 on it.

Sep 27, 2010 | 1998 Chevrolet K1500

1 Answer

1997 Mercury Mountaineer What is Catalyst Efficiency Below (Bank


it means the catalyst is worn out, the efficiency is monitored by sensors, when the Cat falls below a certain reading or "threshold" the code is generating telling u that u need a new catalytic converter.

Feb 18, 2010 | 1997 Mercury Mountaineer

2 Answers

Wondering what the error code we were told means


First, the check engine light just means you are not meeting emissions right now. Not a big deal. Try disconnecting the battery for 1/2 hour and then reconnect and drive car for 10 miles. It may run rough while it relearns you engine controls again but it often clears the codes.

Now, codes are only 5 digits so I assume the 2 is extra.
P0420 = catalyst efficiency below threshold (bank 1)
P0240 = can't find this code.

Autozone also does free scans. please rate for me, thanks

May 22, 2009 | 2002 Volkswagen Jetta TDI

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PO420" Catalyst efficiency low Bank 1"


Replace the catalytic converter.

Mar 09, 2009 | 1999 Acura TL

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