My check engine light came on about a month ago. Code was catalytic converter. Teh light went off/away on its own. Van ran fine to me & made no noise. Sometimes it would miss/skip once it hit 10 mph. But this morning when i turned the engine on the engine light was flashing & the engine was kind of shaky. I dont know what to do!

have code read if its the cat again check and feel exhaust system and look smell and feel the exhaust it it feels restricted and or smells like sulfur rotten eggs you more than likely have a cat converter problem and that your code will come back again with the same reading

Stop using it,the flashing light is a Class A converter ruining
misifire,so nothing was fixed so far

Sounds like you have cylinder misfires that ruined the
converter & only the converter was replaced.

The last thing you do, is the converter, AFTER you diagnose the systems to find out why it failed

i have replaced an O2 sensor and had similar failure after 1500 miles.
I removed it, chkd it, reinstalled it and it ran fine.
P0133 is related to slow response of O2 sensor. P1134 is mfg specific so google that for ur car.

Catalytic convertors' been bad for ten years?!! They're probably plugged.

It’s not. Do you trust your mechanic? If not trust nobody. Are you shore a new one was put on? The only

If the light was on and then went off, the code will still be stored in the computer. Getting the codes read is always the first step to avoid guessing. Also, driving with a flashing check engine light is a great way to damage the catalytic converter...very expensive part.

If the RPM is higher at any particular speed than before, the only cause could be that the transmission is slipping. Things like O2 sensors, Catalytic converters, fuel treatments, etc. have absolutely nothing to do with incresed engine (input) speed to axle (output) speed ratios.

cut mine out a year ago, truck runs fine, check engine lights stay on. you can get dummy plugs to eliminate that problem

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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there are no codes that say replace O2 sensors,or remove converter,Thats just somebody's guessing,When it says O2 sensor that tells the mechanic to look for trouble in that area,wiring or faulty readings,And there are four O2 sensors.