Check Engine Light?

I had the transmission on my Mazda Protege substantially repaired a few months ago. Shortly after that, the check engine light came on, and the car began to shudder somewhat at idle, and also to shudder regularly when I am between 35 and 40 mph. I brought the car back to the mechanic several times. Each time the engine light would stay off for an hour or two and then return. Recently, the car began shuddering consistently on a longer trip, and the engine block could be seen rocking side-to-side. That was fixed with the replacement of a wire, the name of which escapes me. No explanation has been offered for why the light keeps coming on. A friend suggested that there is a problem with something called the vacuum module, and that would require taking the transmission apart again to get to. Any ideas?

Hi :),

Check engine light came on about 4 days ago my daughter called me in a panic! Had her friends dad do visual inspection check oil. Drove home light turned off w/o actually resetting or anything, Then she was driving to work yesterday and it came on again, this morning I checked her fluids, coolant tank a bit low so I filled it and it was off. Today driving home check engine light came on again? Seems so strange to me it is coming on and turning off? I am a single mom and pretty handy with basic mechanics, I changed her thermostat in the summer w no issue, have changed alternators etc in other cars but I do not have a tester and not really money to take to a shop. Any suggestions on where to go next? I read could be MAS air flow, intake hoses? What do you think?

Autozone scanned for my daughter P0106. Said it is Map sensor but to check my hoses before I go buy and replace. I asked if its doing damage to drive it, her said no car will run a bit rougher use more gas. Is this something I can change myself? Is there anything specific I should know if I do myself, special tools etc?
Thanks guys for you r help, I look forward to reading your thoughts, advice on this!

Jessica

The day after getting my condenser replaced, my fiancee and I had driven 85 miles when I noticed the check engine light on. It wasn't safe to stop right there so we stopped at the next exit, but when we did, the car had overheated and radiator fluid was steaming out. When we opened the hood, we found the radiator cap was off, sitting upside down placed next to where it should have been. I had not opened the hood at all from the time I picked it up from the shop until it overheated. Unfortunately, the car had blown a gasket and well over $1000 of damage has been done. The auto shop that replaced our condenser claimed they could not have left the cap off for us to have driven 85 miles. Most every other mechanic I talked to said that on that cool morning with calm continuous travel plus one stop the fluid could have come out slowly, and that the cap very well could have been left off. Now their claim is that all the fluid would have come out during our earlier stop if the radiator cap was off. I admit his new point puzzles me, because I can see that the fluid should have come out at the earlier stop, but we saw nothing. I have a hard time conceding that the cap was blown off between that stop and when it overheated, because there is no damage to the cap or radiator. We heard no bang. There was not very much fluid left in the radiator so the fluid must have been slowly expelled such that we didn't notice it.
Any explanation for why it wouldn't have sent out fluid at the first stop? Could it be that they had never put enough fluid in the car in the first place?
The mechanic wants $800 to fix it now (down from $1200) so I need an explanation one way or the other.

Thank you Mark

But why didn't the radiator fluid come out when we stopped earlier? A state regulator thinks the mechanic may have a good point here. Something isn't adding up because as you say the cap isn't going to lie neatly upside down next to the neck, which is why I wonder if perhaps besides leaving the cap off that perhaps the mechanic had also neglected to refill the radiator.

I have a 1999 Mazda Protege and the check engine light doesn't come on when the ignition is in the run position. I believe the dealership disabled the check engine light but don't know how to get it to work again.

It may be a burned out bulb but I do have fault codes that come up when the engine is checked but the check engine light isn't ever on.

I have a
Mazda Protege, 2001, 62000miles, 1.6L engine.

Check engine light is on with p0171 error coded-system too lean. Car has poor acceleration, engine roars yet it takes a minute or so for the car to accelerate past 20 mph. And when you take foot off the accelerator, car feels like it is braking. Changed 02 sensor.

Had diagnostic done. Mechanic said everything looked ok except for the fuel system was dirty, and spark plugs may need to be changed. So he cleaned it, however I did not get him to change the plugs.
Have not changed spark plugs yet. Could this be the problem?

The mechanics said the Air flow meter works correctly. Is the Airflow meter same as the MAF?

What could it be?

Hi,

I have Mazda protégé 1999 engine size 1.5 l and everything seem to run properly just, after some time the cheek engine light coming on and after I restart computer on the car, the light goes off but after some time goes again on, and car seems to run ok. So please tell me what to do. Thanks in advance.

Check the connector of oxygen sensors or its circuit.