Question about 2004 Hyundai Tiburon

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Failed emissino test again says the oxygen and catalytic are not ready what do i do i only need one to pass?

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I had similar problem with not ready after clearing a check engine code for cylinder 5 code. I had to drive another 400 miles before code changed from not ready to ok. Just drive and periodically go to inspection to get it checked. It will clear up after driving enough miles.

Posted on Sep 18, 2010

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Cant pass emissions,i need at least one of the not ready status to become ready status out of the oxygen senson, evaporative system, catalyst


drive it. I am betting you have recently "cleared" codes which also clears readiness monitors in an attempt to better control people cheating the system. After enough drive cycles are reached the monitors will pass if nothing is wrong and turn to ready. If the problem that the codes implicated where not fixed than the check engine light will again come back on and you will again fail your attempt to pass emissions.

Drive it for a week or so and see what happens.

Aug 15, 2015 | Cars & Trucks

3 Answers

2002 Chevy replaced Egr valve and oxygen sensor 2says not ready for Egr and evap


Replacing parts on the chance of solving the problem can get expensive. Take it to someone who has a scanner tool to check the sensors. Sound like you have a sensor not working.

Jun 18, 2014 | 2002 Chevrolet Impala

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What is code P0420, check engine light, 2004 Iszuzu Rodeo


Catalyst System Efficiency Below Threshold I have put together the following information about the P0420 fault code. I have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0420
Fault Code Definition
  • Catalyst System Efficiency Below Threshold
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be some performance problems noticed by the driver such as a lack of power from a restricted and/or damaged Catalytic Converter
Common Problems That Trigger the P0420 Code
  • Inefficient Catalytic Converter(s)
  • Defective Front or Rear Oxygen Sensor(s)
  • Misfiring engines
Common Misdiagnoses
  • Oxygen Sensors
Polluting Gases Expelled
  • HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog
  • CO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas
  • NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog
  • Most of the aftermarket Converter companies are re-working their designs so they can be certified for use in OBD-II vehicles in California
The Basics
The Catalytic Converter looks like a muffler. It is typically a stainless steel housing over a ceramic honeycomb core. The catalyst itself is made of platinum, palladium, or rhodium, all rare metals, which is why Catalytic Converters are so expensive. These elements reduce the toxicity of harmful exhaust gases that are expelled from the tail pipe. Catalytic converters are quite efficient, but if engine maintenance is neglected or an engine is allowed to "run rough," damage could occur, resulting in costly repairs. To replace the Catalytic Converter, the vehicle is raised to gain access to its underside. The converter is removed from the exhaust system and the new Catalytic Converter is installed.
Want to Learn More?
The Catalytic Converter is a sophisticated after-burning device designed to complete combustion of the exhaust gases that pass through it. It is a stainless steel container with an inlet and outlet pipe that looks similar to a muffler. Inside, the Catalytic Converter is a ceramic monolithic structure that has honeycomb-like passages running though it. This structure has several sections called beds that are thinly coated with rare metals, which react with the compounds in the exhaust gases to complete the combustion process, thereby cleaning the exhaust of harmful emissions.
  • The first section of the Catalytic Converter is called the reduction bed and is coated with rhodium. It is called the reduction bed because its purpose is to reduce the NOx gases back into harmless nitrogen and oxygen.
  • The next section of the Catalytic Converter is the oxygen storage bed, which is coated with cerium. Its purpose is to maintain an ideal level of oxygen for use by the rear of the converter. It does this by storing and releasing the oxygen that gets released from the reduction of NOx in the previous reduction bed.
  • The oxygen is then available for use in the final oxidizing bed, which is coated with platinum and palladium. The purpose of the oxidizing bed is to complete the combustion of CO by adding oxygen. The oxidizing bed also uses oxygen to burn any of the raw HCs that still remain in the exhaust gases.
P0420 Diagnostic Theory for Shops and Technicians
The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor(s) and an increase in switching activity-from rich to lean to rich, etc.-that closely resembles the front Oxygen Sensor(s) during the time the computer is activating the Catalytic Converter monitor test. The voltage threshold is usually a minimum of 650 millivolts, which indicates a low level of oxygen. When the voltage goes too far below the 650 millivolt minimum, it indicates a higher level of oxygen. This means that not all of the oxygen is being consumed by the combustion process or by the afterburning effect of the Catalytic Converter. When the oxygen level gets too high, it means that the Cerium or Oxygen storage bed has degraded to the point where it is no longer able to store oxygen created by the reduction of NOx (nitrogen and oxygen). This oxygen is essential for the rear Oxidation bed to complete the conversion of CO into CO2 and HCs into H20 and CO2.
Common Tests for Diagnosis of the P0420 Code
  • Retrieve the code and write down the freeze frame information to be used as a baseline to test and verify any repair.
  • If there are any misfires, ignition, fuel and/or intake problems, these must be repaired before the Catalyst code is addressed. Any misfire, ignition, and/or fuel system problem will quickly ruin a Catalyst. They are often the cause for code in the first place.
  • Test drive the vehicle at or near the freeze frame conditions to verify that the rear Catalyst Monitoring Oxygen sensor is either mirroring the front Oxygen sensor and/or is not reaching the 650 millivolt threshold during 55-60 MPH cruise conditions. If either of theses conditions can be easily verified, then the Catalytic Converter is defective.
  • If there is any doubt about the condition of the front and/or rear Oxygen sensors, then check the Mode 6 data for all the Oxygen sensor monitor tests. If any of the front or rear Oxygen sensors barely pass their Mode 6 tests, then clear all codes and perform a drive cycle to see how well the front and rear Oxygen sensors pass their Mode 6 tests. They need to pass the Mode 6 tests with flying colors or they will confuse the OBD-II diagnostic software and possibly trigger a false code P0420. This is an important concept because if the front Oxygen sensor is slow and barely passes its monitor tests, it can fool the computer into thinking that the Catalyst has failed because the computer just watches how closely the switching speed of the front Oxygen sensor compares to the switching speed of the rear Monitoring Oxygen sensor. If the rear Monitoring Oxygen sensor is losing bandwidth and not able to easily reach the 650 milli volt threshold-but still barely passes its monitor tests-then it, too, can fool the computer into setting a P0420 code.
  • If the Catalyst has failed, be sure to check for any software updates for the power-train computer. Many of the OBD II-equipped vehicles require software updates whenever the Catalyst is replaced

Jun 17, 2014 | 2004 Isuzu Rodeo

1 Answer

2004 dodge stratus 2.4L not passing emissions test why Emission saying Catalyst Not Ready Oxygen Sensor Not Ready I put 375 highway miles on the car, hopping this will pass it.


Again, TOO LITTLE INFO!!!

could be a non operating oxygen sensor heating, check connector and damaged wiring, as it is posible to damage wiring or connector at this very hot plecement. Amclaussen.

Sep 27, 2013 | 2004 Dodge Stratus

2 Answers

My 1997 Honda Civic failed it's Emissions Test. See below the ASM Emission Test Results. What do you suggest I do to get the car to pass the smog test? ASM Emission Test Results: 15mph - RPM = 1587...


Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

Apr 05, 2011 | 1997 Honda Civic

1 Answer

2004 Dodge Ram P0420 code. What could be causing this? My emissions are clean (all were within limits), and I just replaced all 4 oxygen sensors


This code is set when the catalytic converters are operating below tolerable efficiency limits. Basically, your catalytic converters are bad and are in need of replacement. You can have bad converters and still pass emissions, but your computer uses the oxygen sensors to determine how well they are working. If the readings are out of a set tolerance, the check engine light will illuminate and DTC P0420 will set. Clearing the code will turn the light out temporarily, but the next time the test is run, the light will come on again.
Hope this helps.

Oct 20, 2010 | 2004 Dodge Ram 1500

4 Answers

How do I fix the PO421 code? I own a 1996 Ford Probe that hasd failed the e-check because of the PO421 code. What do I need to do to solve this issue?



the trouble code means that the oxygen sensor is reading that your catalytic converter is no longer operating properly. Either the oxygen sensor(s) is faulty and is giving an incorrect reading or the catalytic converter is faulty. You should have a flow test performed on the cataytic converter to ensure it is performing properly. You can also check your oxygen sensor(s) before replacing them

Sep 30, 2009 | 2003 Mitsubishi Lancer

1 Answer

Trouble code p2000


P2000 NOx Trap Efficiency Below Threshold (Bank 1)


This code usually indicates a faulty oxygen sensor(s). However, in some instances it can also be used for a faulty catalytic converter as well, since the O2 sensors are located on the exhaust system along with the cat. converter(s). You should check your O2 sensors before replacing the catalytic converter. Here is a guide on checking these sensors.

All engines run on a optimum fuel to air mixture called "stokiometric" which means chemically balanced. This balanced fuel to air ratio is 14.7 to 1, 14.7 parts air to 1 part fuel. The oxygen sensor is created using the active chemical such as zirconium, electrochemical (also known as Galvanic), infrared, ultrasonic and very recently laser. When a lean mixture code is detected by you or a technician the first tendency is to replace the oxygen sensor. The best way to check the operation of the sensor is to run a simple test. No matter if your engines oxygen sensor has one wire or four there is only one sensing wire that feedbacks information to the PCM. To find this wire you will need a car repair manual. If a trouble code is present that pertains to a oxygen heater sensor failure, replace the sensor to repair the problem. A oxygen sensor must be warm before it will operate properly.


Warning: If a malfunction exists with related components such as an engine misfire or engine vacuum leak do not perform this test. The oxygen sensor to designed to operate within a particular range, if this range is exceeded the sensor will give the appearance that it has failed.

SENSOR TEST PROCEDURE---

  • Step 1 - Once the oxygen sensor sensing wire has been located connect a volt meter to the feedback wire and ground. Select the millivolt operation on the meter.
  • Step 2 - Next, start and run the engine at idle until warm (about 15 minutes). Observe the voltmeter, it should bounce slightly at whatever voltage the sensor is centered at (about 150 millivolts).
  • Step 3 - Continue to observe the meter and have a helper rap the throttle. The meter should drop for a split second as the mixture leans out in the first milliseconds of the throttle bore being opened. Then quickly rise for a spit second as the throttle closes and the mixture richens. The volt meter should stabilize at the original operating voltage when the engine returns to idle.
Remember, if the sensor fails this test, replace it but if it passes, replace the Catalytic converter...

Please rate and have a great day:)



Apr 30, 2009 | Dodge Ram 3500 Cars & Trucks

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