Question about 1999 GMC Jimmy

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Check engine light with low emission code for catalytic converter

Low mileage, good condition vehicle, 84K miles, regular maintenance upkeep, check engine light on, had tune up including new spark plugs, plug wires, replaced distributor & cap, fuel filter, added "bar leak" to coolant just in case internal leak, solved problem for awhile(also had replaced original converter 1 yr ago due to rattling noise, now check engine light back on with same low emission code, had converter tested and no problem, is it a O2 sensor issue or something else? Any suggestions on what to do or look for?

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  • annetteto Jun 09, 2009

    I had the oxygen sensor(s) replaced. So far, this seems to have corrected the problem. The check engine light is off and was cleared from the computer. Thanks for the help.

  • yadayada
    yadayada May 11, 2010

    what is the code, blind on this without that code.

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Check the fuel pump pressure. should be between 60 to 66 psi. There isn't an easy answer for this one. You may need to perform component testing and a diagnostic check.

Posted on Jun 09, 2009

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Check engene light


Hi Christian:
The Check Engine or Service Engine Soon light or an icon resembling the engine is technically called a Malfunction Indicator Light or MIL. It comes on when your vehicle's computer detects a fault that can affect your vehicle's fuel economy and the exhaust emissions.

Here are the five most common reasons your "check engine" light might come on, and what you can expect to pay for the repair, including labor, according to CarMD:

1. Faulty oxygen sensor
The sensor measures the amount of unburned oxygen in the exhaust and tells the car's computer how much fuel is in the tank. If a faulty one is not repaired, the car's gas mileage could drop, since the sensor is sending incorrect information to the car. It costs less than $200 to repair.

2. Loose or missing gas cap
Technicians will often tighten the gas cap for free, or replace it for a few dollars. If it's not replaced, gas will evaporate from the car and decrease its gas mileage.

3. Broken catalytic converter
This one isn't good news, since it can cost up to $2,000 to replace. The catalytic converter uses a catalyst -most often a precious metal such as platinum- to convert harmful gases left over from combustion to less harmful emissions. CarMD says catalytic converters generally won't fail unless a related part, such as a spark plug, malfunctions, so it's wise to keep up with the car's maintenance schedule.

4. Malfunctioning mass air flow sensor
This sensor measures the amount of air supplied to the engine, which determines how much fuel should be delivered. When it malfunctions, it can result in a loss of power to the car, surges during acceleration and a decrease in fuel economy. It costs around $375 to fix.

5. Misfiring spark plugs
Spark plugs are small but essential, since they make the car go by igniting the compressed fuel in an internal combustion engine. Misfiring spark plugs can affect engine power and fuel economy and can also damage the catalytic converter. You can replace spark plugs yourself for as little as $10 or pay $300 for a technician to do it.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 04, 2011 | 2001 Ford Ranger Regular Cab

1 Answer

Loss of power check engine light


is the check engine light on ! if so it may be a clogged up convertor. here is the symtoms, A clogged catalytic converter reduces the flow of a vehicle's exhaust by creating a constricted and/or blocked exhaust channel, which engine exhaust gases flow through on their way out of a vehicle's tail pipe. By reducing the flow of exiting engine exhaust gases, a condition that creates an increase in engine exhaust back pressure (thereby reducing engine efficiency), a clogged catalytic converter results in a small reduction in engine horsepower. A clogged catalytic converter causes a reduction in vehicle gas mileage.
Fumes leaving exhaust is sulfurous as if it is coming from a rotten-egg is one of the unmistakable clogged catalytic converter symptoms. good-day !



Nov 09, 2011 | Cars & Trucks

1 Answer

2006 chevy cobalt(85000 miles) check engine light comes on and stays on. I am getting the check engine light code p0420. Engine seems to be running smoothly.


http://www.obd-codes.com/p0420

TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
there is a service bulletin for this.

http://www-odi.nhtsa.dot.gov/cars/problems/tsb/results.cfm?start=1&SearchType=DrillDown&type=VEHICLE&year=2005&make=CHEVROLET&model=COBALT&vehtype=PC&typenum=1&component_id=0&summary=true

Aug 02, 2011 | 2006 Chevrolet Cobalt

2 Answers

SERVICE ENGINE SOON LIGHT CAME ON READS CODE P0431 AND P0421


Converter is not working as efficiently in Bank 1 and Bank 2 (two codes)...

P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 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.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

Causes: A code P0421 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
A sparkplug is fouled up

Possible Solutions:
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). 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.

P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Basically this 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.

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

Causes: A code P0431 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

Possible Solutions:
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.

May 05, 2011 | 2004 Mitsubishi Endeavor

2 Answers

05' Dodge RAM 1500 code p0420. I've been changing oxygen sensors since u bought it 2 years ago, thought the problem was solved but yet again check engine light came on, could there be an other problem??


Hello: Code P0 420 indicates the catalytic converter is operating below calibrated efficiency (below 60%) replacing the oxygen sensors will not correct the condition. The converter needs to be replaced and the code cleared.

Apr 04, 2011 | 2005 Dodge Ram 1500

1 Answer

My check engine light is on & a diagnostic code check says it could be the catalytic converter (140,000 miles on vehicle), a vacuum leak, or O2 Sensor. What in your opion would be the most probable...


The catalytic converter being bad will definitely cause a drop in mileage and also a loss of power. Do you hear a rattling type sound when the vehicle is started cold or just when the ignition is shut off? Also if you bang on the converter with your hand, you may be able to hear the loose material rattle inside if it is bad. I think your Explorer has four catalytic converters also. What are the specific codes you received?

Mar 25, 2011 | 1996 Ford Explorer

1 Answer

P-0420


The definition of code P0420 Is Catalyst Efficiency. You may have an oxygen sensor problem or a catalytic converter problem. Your vehicle has 2 oxygen sensors. Check your oxygen sensors.If they are then you may need a catalytic converter. Depending on your mileage it may be covered under a Dodge emissions warranty. Have it checked by a certified garage first and in the meantime contact your local Dodge dealer and find out the emissions warranty most are 8 yr or 80,000 miles.

May 20, 2010 | 2003 Dodge Neon

1 Answer

The only fault code on 2001 kia sephia is P0422, catylist threshold low.... car ran for 2 weeks fine after new fuel pump, and then just died like first time.... 126 thousnd miles and plenty of fuel, fuel...


P0422 - Catalyst below threshold.

Catalytic converter is clogged or out of medium.

Replace it.


ACTUAL DIAGNOSTIC:

Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0422 Code

* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter

Common Misdiagnoses

* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem



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Jan 24, 2010 | 2001 Kia Sephia

2 Answers

Poor fuel mileage with my 02 nissan altima


yes it very possible because the catalytic converter is part of the emissions and you need to ask yourself when was the last time you had a good tuneup drive belt,sparks and wires if needed and a fuel filter and a pvc valve.

Feb 08, 2009 | 2005 Nissan Altima

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