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 problem/s?

442 check or replace gas cap,with NAPA parts I had problem.

You have a random misfire issue follow the link for info on this problem. Problem 6 Engine Stalls Misfire Code Cylinder Misfire

2nd air induction code need to know wht eng. you have

did you replace stereo

problem is bad AIR FLOW sensor! I am replaced in my 1.8T PASSAT with tuning chip 6.pcs air flow sensors over 3 years !!!!! All VW cars have a air flow problem!!!!! And not only this!!

• 16706 P0322 Ign./distributor Eng. Speed Inp. Circ No signal
• 16687 P0303 Cyl. 3 Misfire Detected
  
• 16806 P0422 Main Catalyst, Bank 1 Below Threshold

P0322 Could be caused by a faulty Engine Speed Sensor also known as a Crankshaft Pos./Engine Speed Sensor.

P0303 Might have a faulty #3 Fuel Injector, Faulty spark plug and/or faulty spark plug wire and connectors.

P0422 Either your front 02 sensor is faulty and/or your catalytic converter is fried and needs replacing.

this is the engine electonics lamp or eml, basically covers upto 2000 different codes, if it hasnt gone out its a permanent fault but if the car is driving ok not too serious if its major (petrol models) the lamp will flash. Refer to a good garage/ vw agent or specialized in diagnostics to fix.

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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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.!@##

Hi,
A good start would be to go you the Diagnostic Trouble Codes list at http://www.bentleypublishers.com/tech/vw/vw.dtc.table.htm

The DTC's, also known as fault codes, may have other meanings but the list above should point you in the right direction.

Hope this helps - if so a rating would be really appreciated. If is doesn't then "add a comment" instead and I will try to help you further.
Cheers D..