Question about 2001 Cadillac DeVille

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2001 Cadillac diagnostic intermittent code points to catalytic converter but car rides smooth. no indication of problem with catalytic converter.

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The problem could be that the convertor is no longer doing its job of reducing the emmissions which you wouldn`t notice any performance problems with the drivability of the car.you should have a convertor efficency test done to the convertor to eliminate or prove the problem.it could also be an o2 problem that you have.it should be put on a scan tool to see what the readings are while the car is driven.this may help in finding the problem

Posted on Oct 17, 2011

  • robert wales Oct 17, 2011

    the problem could be that the convertor is no longer doing its job of reducing the emmissions which you wouldn`t notice any performance problems with the drivability of the car.you should have a convertor efficency test done to the convertor to eliminate or prove the problem.it could also be an o2 problem that you have.it should be put on a scan tool to see what the readings are while the car is driven.this may help in finding the problem

  • Bennie Lovette Oct 19, 2011

    Thanks! That was very helpful!

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06 Cadillac STS V8 car has codes P0174 and P0420.


• DTC P0171 Fuel Trim System Lean Bank 1
• DTC P0174 Fuel Trim System Lean Bank 2
.
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without oxygen sensor (O2S) input. During Closed Loop, the O2S inputs are added and used by the ECM to calculate short and long term fuel trim (FT) fuel delivery adjustments. If the O2S indicates a lean condition, FT values will be above 0 percent. If the O2S indicate a rich condition, FT values will be below 0 percent. Short term FT values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets.
Diagnostic Aids
• Excessive resistance in the fuel injector ignition 1 voltage circuit or the fuel injector control circuit may cause the following symptoms:
- Lean condition
- Misfire
- Rough idle
• The system will go lean if an injector is not suppling enough fuel.
• A lean condition could be present during high fuel demand.
• A malfunctioning MAF sensor can cause this DTC to set. Refer to DTC P0101 .
• Review the Failure Records with a scan. If an intermittent condition is suspected, refer to Intermittent Conditions .

DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC P0420 Catalyst System Low Efficiency Bank 1
• DTC P0430 Catalyst System Low Efficiency Bank 2

This code could mean the catalytic converter on that bank has failed .

Causes of lean condition trouble codes P0171 P0174 GM 5 3L

P0420 P0430 catalytic converter catalyst inefficiency code diagnosis

Mar 28, 2018 | 2006 Cadillac STS

1 Answer

Why doesnt a code come up on my 1992 Cadillac Seville for a bad Cadillac converter


Anon, There can be codes thrown when converter is bad and a lot of time there will be codes/not always, why I do not know. To actually determine if converter is bad, there are test/diagnostic procedures.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Troubleshooting bad catalytic converter and misfire DTC P0420
What causes catalytic converter to go bad Ricks Free Auto Repair Advice
1991 4 9L Poor Acceleration Vibration in gear Engine Miss NO CODES FYI
EXPLAINING TROUBLE CODES PO420 PO421 PO430 PO431

Jun 29, 2014 | 1992 Cadillac Seville

1 Answer

Engine code 430 for 2001 toyota highlander


Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Diagnostic Help:
To diagnose a P0430 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilloscope to check the waveforms of both upstream and downstream O2 sensors. The rear reading should vary, the front should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component. hopes this helps thanks

May 30, 2010 | 2001 Toyota Highlander

1 Answer

The check engine lamp on my vw jetta 3 is ''on'', i put a diagnostic reader on and it showed the following codes:P0422,P0411,P0300B,P0301B,P0302 and P00172B, what do they mean and how can i solve the...


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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May 06, 2010 | 1996 Volkswagen Jetta

3 Answers

Po420 code monte carlo ls 2001


PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

Apr 20, 2010 | 2001 Chevrolet Monte Carlo

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



Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.$%@#

Jan 24, 2010 | 2001 Kia Sephia

1 Answer

2001 mitsubishi galant,2.4L eng. Getting DTC 421. Is this code related to the catalytic converter? Check eng. light always on, also DTC 302 showing.


DTC code P0421 is the O2 sensor that indicates a an issue with the Catalytic Converter. Replace the O2 sensor to the Catalytic Converter "the one after Converter" It's common for the sensor to fail and you can pick one up from Auto Zone and they will have the step by step instructions to replacing the O2 sensor. 
DTC code P0302 Indicates a misfire on cylinder #2. Address the spark plug, spark plug wire, and injector. Look for any damages and try running some fuel injector cleaner through the fuel system to clean out the injectors. 
Good luck and hope this helps. 

Aug 11, 2009 | 2001 Mitsubishi Galant

1 Answer

Check engine light on for sometime; Response to throttle sluggish


If your catalytic converter is "below efficiency" or otherwise clogged, you will lose power as you drive and the vehicle heats. The more you drive the vehicle, the worse the problem will become. The exhaust can't escape properly through the catalytic converter, therefore your engine won't run properly. Your issues are related, and if you replace your catalytic converter they should go away.

May 26, 2009 | 2001 Volkswagen Jetta TDI

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