Got to see wich cylinder is misfiring get it scan when the light flash its to warn you that you might damaged your cathalytic converter
If check engine light is flashing it means pull over and stop driving, you are damaging your engine. I would take it back to whomever did the work immediately
Have it scanned , was the computer cleared after all this work? And or have you driven this vehicle more than 40 miles. As it usually takes about 40 miles for the light to come back on. I would scan it and if there is more than one code. Check the first code clear and drive. As if one thing being wrong/bad part would make the computer to try and correct air/fuel mix and throw more codes.
SOURCE: 2002 chevy malibu catalytic converter
You probably have way too much unburned fuel in your exhaust system (how's your mileage?) or possibly a failed oxygen sensor that is giving false information to the computer.
SOURCE: engine light keeps coming on, had catalytic converter replaced 2x
a bad or disconnected oxygen sensor will make the engine run rich.
How about a clogged air filter?
SOURCE: Catalytic converter is bad on 1995 Subaru Legacy L Wagon
dearship parts are high.you can buy a factory catalytic converter or universal converter cheaper at auto parts place.they basic the same parts the.dealership has same catalytic converter.they put their price and labor rate charge an hour your pocket book will be empty.i have used universal catalytic converter.had no problem with it.the only difference is universal converter body a little shorter.but has same lengh as factory.if check engine is coming on you cant turn it off .if computer showing you a code.you could have a misfire causing rich exhaust emission.that can ruin a catalytic converter have it scan.dealership charge you about $130.00 .you can have it scan at advance auto or auto zone.to see what pcm code is.it could be oxygen sensor somethinh minor.
SOURCE: 2004 VW Jetta 1.8T
Loss of power? How many miles? Plug, plug wire or ignition coil(if seperate poles) would be my guess.
SOURCE: Engine shaking after timing belt replaced
No repair should only last three weeks...don't touch anything and have the shop that did the work come and get it. I have lots of ideas but it will need to be checked over to verify them. Rather than comment on the "maybe" of this, have them check it out. Any reputable shop will be more than willing to do what's needed...Bad jobs ruin that reputation!
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