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The cat red light is flashing on my golg mk3 - Golf Volkswagen Cars & Trucks

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How to remove a cat from a mk3 galaxy 2006 tdci


it probably is not a bolt on cat but one that is welded into the pipe . they do not want us fixing this stuff anymore seems like

Sep 23, 2015 | 2006 Ford Galaxy TDI

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99 Mercury Cougar cat glowing red. Replaced thinking it was plugged and still glowing cherry red with exhaust unhooked.


Im guessing the ck engine light is on? Something is dumping gas and heating up cat, you need to check have scanner hooked up and engine data looked at...look at long and short fuel trim, tis will tell you what's going on or at least give you a direction to go.I wouldn't drive it, gonna ruin new cat

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Obd light on, idle rough, smell, no throttle


The obd light with tell specifically what it is, is it gas or rotten egg - the latter means catalytic converter, gas smell probably flooded or not firing on one or more cylinders, need more details. Also, if the light is flashing it's warning of catalytic damage - raw fuel hitting the cat, smell could be heat from cat trying to burn off raw fuel,it will glow red hot.

Dec 15, 2013 | Chevrolet Aveo Cars & Trucks

2 Answers

Engine light on code reads bad cat replaced it light returns reads ox senors replaced it light returns reads cat gone bad.


the ECU (brain) has no idea at ALL what is broken!
it only knows 2 things, bad inputs. and failed tests.
nothing else. The brain is not AI (artificial intelligence)
Not even and expert system , yet.
that is the job of and ASE mechanic
to find the cause. and not GUE$$.

your failure to state the DTCs reported , sorry, is bad news to anyhelper, sorry!
420s. is , weak CAT test. but in most case it's not the CAT.
senors replaced? 1 or both.? B1S1 and B1S2?

Did you get o2 (oxy) DTC failures?, if yes, ignore all cat fails.!
if other codes/ DTC, that too, means ignore cat failure.
the CAT monitor (P042x) only is valid if the engine runs prefectly.
if not the CAT overheats or underheats( goes dead cold)\

the cat will over heat, (cel flash madly) for gross engine over fueling (1 example , bad fuel reg, and pressure at 60PSI)
the cat glows red hot , or near. and the test may fail.
case 2: the engine (AFR fuel) is grossly lean the CAT may go under temperature and drop off line.
we call this CAT no lit off, it has a minium working temperature.
as air leaks in front of the cat causes EFI to go very rich.
and leaks behind can make the rear 02 go nuts. and lie
and say, bad Cat.
all this is the domain of the ASE mech. he knows all stuff.
and never ever lets the ECU tell him what to do.;
it does tell him (suggests) a battery of test.
sure.
hope that helps,
post all stored, DTC,all pending and the full freeze frame data
and if cagey? the closed loop status hot idle.

Oct 14, 2013 | 2006 Suzuki Forenza

1 Answer

Holden jackaroo starting


sending water into the exhaust can damage the cat damage the sensors. even suck water into the egr from first stroke. as it sucks on first stroke of the engine.

Oct 13, 2013 | Cars & Trucks

1 Answer

I have a 1994 golg gti and after running for a few kms engine stops suddenly after a while starts again


What is a golg gti i know its a good German mad car but i havent heard of that one .
But no matter Check the fuel tank breather as 9 times out of 10 the breather is blocked and dont let the air in when you are taking the petrol out ...also check ORget the pump checked out as its in the fuel tank and its a high pressure pump and if you are loosing power in the pump then you wont GO and have to wait till the power comes back..
Let me know how you go Ron

Oct 07, 2009 | 1995 Volkswagen GTI

1 Answer

VW Golf Mk3 2.0L 16v low idle rev/cold cut out


hi i have the same problem.but i cat find what to do.iff u eill find out please le me know.07853592087

Jul 30, 2009 | 1994 Volkswagen Golf

1 Answer

Ford Mondeo Mk3 Estate 2L. Air bag / seat belt Warning Light


Common fault on FORD
Usually due to a poor connection in the YELLOW PLASTIC CONNECTOR underneath the passenger seat.


Just push it together properly and it should clear the AirBag fault


Jun 30, 2009 | 1999 Ford Taurus

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