Q: EVAP system Pending catalytic code with CEL

asked by on February 25, 2017

I recently bought an 04 mazda 6 from a private seller the car starts and runs great a little sluggish upon acceleration from a stop but otherwise a very well running car. About 50 miles down the road CEL illuminates.I take it to be looked at and the EVAP system isn't ready and has a pending catalytic code.the mechanic was dead set it was just leaks.so we smoked it and repaired the leaks.I took it to be inspected because I'm only on a 10 day and it failed emissions for evap and the pending cat code the mechanic said it just needed to be driven more so I did so and low and behold 30 miles in that lovely CEL is back on.This is becoming an issue and I'm running out of time any idea as to what I should try next.

My car has 126000 miles.
My car has an automatic transmission.

It is possible that you could be experiencing a catalytic converter failure. This can be due to the fact that after driving 30-50 miles the exhaust system heats up quite a bit. Once the exhaust is heated up the catalytic converter begins to show signs of failure. Often times when the precious metals inside the catalytic converter fail, they melt together as if they have been welded. This makes the orphice through the catalytic converter much smaller and increases the backpressure of the exhaust. This will prevent the engine from breathing properly. I would recommend having your catalytic converter inspected and replaced as necessary to resolve this issue.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I delete a paired phone?
If you would like to delete one of the Bluetooth paired phones, you can do so very easily: 1. Turn on the infotainment system. 2. Press the CONFIG button. 3. Use the MENU/SEL knob to select Phone Settings or Bluetooth...
Sunroof not closing all the way
Hi. Sometimes debris lands inside the track and can cause similar complications. If thats not the case, a certified mechanic from YourMechanic can inspect the sunroof system. It can be a switch problem or the sunroof module just needs to...
My car makes a very odd beeping noise, what gives?
Hi there. This is most likely a service reminder indicator chiming. Take note of any messages on the display panel. It could also be the seat belt reminder chiming. This could be due to the belt being unfastened or the...
Brake pads warning light after having them replaced
The brakes have a brake pad sensor that alerts the driver when the pads get worn down. If you have had the pads and rotors replaced within about 24,000 miles or less, then you may have issues with the brake...
I'm having a problem with my car shifting hard in first and second gear it does this after about 20 mins of driving it
Hello. From what you describe it would appear that your issue may be occurring after your vehicle warms up. The first thing I would do is check your vehicle's transmission fluid (https://www.yourmechanic.com/services/transmission-fluid-service) to see if it may perhaps be low...
Rack and pinion has been replaced three times in three months
Without knowing the specifics, it's hard to say who or what is responsible. I can say that there are some parts rebuilders out there that are turning out some badly inferior products and selling them for very tempting prices. You...
There was too much oil put in my car it got drove about mile maybe before sucked back out it is smoking a lot how long will it con
The 2012 is sensitive about how much oil is in the engine. If it has been overfilled, you probably have oil in the exhaust system and the crankcase vent system. The first thing you need to do is make sure...
Des getting a new ignition mean you have to get a new key?
If you are needing to replace the ignition lock cylinder where you put your key in to start the car, then yes a new key is typically provided with the lock cylinder. Sometimes programming of the key is necessary for...
My car runs but says no key detected.
There is a problem with either the key fob or the electronic control system in the car. Occasionally, cell phone interference causes issues with the system leading to the "no key" warning light. With regard to the key fob, I...

Related articles

A Buyer's Guide to the 2012 Mazda CX-7
If If you want an SUV, but don’t care as much about the “utility” part as you do the “sport” features, you should take a look at what the 2012 Mazda CX-7 has to offer. Key Features With a turbo...
The Best Used Cars to Buy for Occasional Drivers
Not Not everyone relies on their car on a daily basis. Maybe you aren’t the type that deals with a daily commute, and running from here to there constantly. If that’s the case, you may be looking for a car...
The Best Used Cars to Buy If You Don’t Have Kids
Buying Buying a used car is rarely a simple process, but if you don’t have kids, you have many more options than those who have to account for additional passengers. There are plenty of choices out there, depending on your...