Last post on Jan 06, 2013 at 9:24 PM
You are in the Mazda Millenia
What is this discussion about?
Mazda Millenia, Sedan
#3205 of 4030 Engine Light on my Mazda Millenia
Oct 28, 2004 (5:00 pm)
My engine light is on on my Mazda Millenia and I have taken it to 3 different Mazda Dealerships and have recieved 3 different responses. They range from senors, to tune-up to catalytic converters. Can someone please help me? I took it to AutoZone and they pulled a tune-up or catalytic codes. I have 95000 miles on it. It is a 2000 Mazda Millenia S. If anyone can help, I would be grateful.
#3206 of 4030 Re: Spark plugs [kaput]
Oct 28, 2004 (5:07 pm)
I'm having the same problem with my Mazda. What did you do to fix the problem with the engine light?
#3207 of 4030 Re: [wwbradley]
Oct 29, 2004 (4:59 am)
Can you please tell me if changing my plugs will stop my engine light from coming on?
#3208 of 4030 Re: Engine Light on my Mazda Millenia [deww]
Oct 29, 2004 (6:50 am)
Hey deww i found this on a previous post.
Check it out, you never know!!
"As an afterthought, the Mazda tech says, oh by the way, your battery is weak at only 375 amps and Mazda recommends 575.
I did a little research and found that the Millenia can set an O2 code (or others) when there is low battery output. I hope this is true. I replaced the battery today. The check engine light is out. Mazda tech said if O2 sensor is bad it should reset the code in 'a few' starts.
Better to replace a battery than an O2 sensor and the catalytic converter. I'm betting that the O2 sensor is OK since I've seen quotes from some Mazda techs that a high percentage of the O2 sensors that they replace are actually good. Watch this space for results of my theory."
#3210 of 4030 mpg and codes
Nov 01, 2004 (6:22 am)
I have an '02 S and I get 24 mpg in town on mine. My parents also have an '02 S and they tend to get 18 - 20 mpg's. The only difference in our driving style is that I tend not to jump on the accelerator like my mom does at times. Plus my mom tends to take a lot of very short trips to the store which I do not do.
If you guys have the code numbers on your read outs I will look them up in the '02 service manual. Though I have found that some of these codes do not tend to always match up with older models. I have also seen in other posts here that a low battery charge can create problems with sensor lights going on.
#3211 of 4030 I've noticed some CEL talk here...
Nov 01, 2004 (6:54 pm)
A Quick Guide to OBDII Codes
That's On-Board Diagnostics, Second Generation. Every vehicle sold in North America from the 1996 model year onward must have an onboard computer and suitable sensors to detect operating conditions that might indicate higher than normal pollutant emissions. Under certain conditions a sensor will detect a condition like this and turn on the "check engine light" (CEL).
Statistics have shown that over ninety percent of check engine light instances are caused by malfunctioning sensors or very transient conditions that happen for unknown reasons. The light might be on, and the condition that occurred for an instant is now gone. We have, folks, a system that is very unreliable in detecting what it was designed to do. A gift of the EPA Clean Air Act, 1990.
The check engine light does not usually indicate a severe problem with your car. It says that "your car may (or may not) be operating in a way that results in higher emission levels". And even worse, some operating conditions may be damaging your vehicle (for example overheating) and the check engine light will not be illuminated because the emissions remain below the threshold.
Know this about the codes.
1/ In some cases a sensor will momentarily indicate a problem. For some types of input, that condition will set a code but not illuminate the light. These are called "pending codes". After a number of reoccurrences, the light will illuminate and stay on. So, it is possible that your vehicle has codes set, but the number of reoccurrences are not high enough to illuminate the light.
2/ In some cases the light will be extinguished after a number of vehicle restarts without a reoccurrence of the condition that set the code in the first place. The code remains in memory after the light goes out for a number of warm-up cycles (usually 40) and is then erased.
3/ Some codes set the light on and the light will never be extinguished regardless of the presence or absence of the original condition.
4/ In my opinion, knowledgeable Millenia owners should purchase an OBD-II code scanner and learn to use it. Plug in, obtain the code(s), write them down and then clear them. I bought an Actron CP9135 (check ebay). A hundred bucks will save useless diagnostic charges and a lot of wasted time.
5/ Millenias have a known problem with overly sensitive rear oxygen sensors. This is covered in Technical Service Bulletin 01-003/01. This shows that codes P0420, P0421, P0430 and P0431 can be caused by this known problem.
6/ Silly things like a slightly loose gas cap, very slight gas impurities, throttle transitions, bad weather, phase of the moon and many other things can cause the light to illuminate. Just turn the thing off and see what happens. If it relights again and again, then deal with it with your favorite mechanic.
If you are reporting your check engine light in this forum, do us all a favor and get the code read. We can't offer much advice without that!
#3212 of 4030 Re: I've noticed some CEL talk here... [wwbradley]
Nov 08, 2004 (4:52 am)
Thanks for all of your help. However, i engine light started coming on about 6 monthes ago. I had 2 sensors replaced already (Not the Knock Sensor). I've had a tune-up. I just replaced my battery. So, I'm not sure what is wrong now. However, I have notice the car is starting to make knocking sound, like it wants to cut off when I'm at a stand still. The Code that were pulled are:
Auto Zone pulled the following codes:
PO421- Warm-up Catalizst Efficienty Below Threshold
PO301 - Cylinder 1 Misfire
Mazda pulled the following codes:
My friend was having the same problem with his Mazda Mill, he took it to the shop and they gave him a tune-up, replaced Knock sensor, and battery. So, I'm not sure what to do.
Also, I have never recieved an o2 sensor or knock sensor code reading. So should I just get another tuneup or have one of these sensor replaced. I recieved a tuneup about 30000 miles ago.
#3213 of 4030 Re: I've noticed some CEL talk here... [deww]
Nov 08, 2004 (9:31 am)
One possible cause of the P0421 is that catalytic converter is failing. Check the voltage at each O2 censor - it should be steady and not fluctuate.
For the P0301 I would replace the plugs, then the plug wires.
P0431 again points at a faulty catalytic converter.
P0455 point to a major leak in the EVAP (emissions control) system. Bad gas cap, or gas cap not on, or another break in the EVAP system.
My guess is that you have two problems. The first is a leak in the EVAP system which caused the system to run lean, which in turn caused the catalytic converter to fail.
Check odb-codes.com for more info.
I would also find a mechanic that will address what the car's computer is pointing to, not just selling you a tune up, battery and knock sensor that may or maynot be a fix to the problem.
Nov 08, 2004 (7:37 pm)
Just a few things to add to what freebird said.
1. On the 301, misfire in cylinder 1, you might want to check to make sure that the fuel injector does not have a problem and that the wiring harness to it is not damaged.
2. 421 and 431, warm-up catalyst system, one is the right hand and the other is the left hand. Check that your front HO2S is not malfunctioning or that your front and rear HO2S are not loose.
3. 455, evaporative emission control system leak detected, check to see that your EVAP hose is not damaged or loose.
These are some other possible items to look at from what has already been mentioned, but this is only a partial list of what could be wrong.
By the way Miller engine has an engine designation of "KJ" the standard engine has a "KL" designation.