Why are the check engine and TCS lights on 99 Mazda millenia?

Answer 1

FLASHING CEL - Park the car and TOW it to the repair place

STEADY ON CEL - Drive it to the shop at your own timing.

Most likely...

The Millenias and their Commonwealth cousins the "Xedos" all suffered a common defect resulting in MOST CEL issues. This engine configuration typically results in the need for replacement of 1 to 2 O2 sensors and / or the DREADED KNOCK Sensor embedded deep in the Manifold assembly. Mine ran 3 years with this CEL on due to the cost of labour one item to replace. The sensor was only 165 bucks while the labour to install was nearly 800.

I will admit once it was replaced I was not only legal again for the Emmissions test, but the thing ran smoother than it ever did ina ll seasons PLUS I got nearly 2 points to my highway Mileage.

Now the codes are confusing on this because two of the O2 sensors share the same circuit and the code wont necessarily identify WHICH o2 is actually bad, that unfortunately is hit or miss. The KNOCK sensor code is separate and distinct however but all will result in a costly set of repairs.

Good Luck

WRONG. WRONG. 2 sensors share the same circuit? where do you get this from? i am looking at the wiring diagram, and there is no such thing. each sensor is on it's own circuit. labor is 800? man, that shop must love you. a generic sensor will cost about 30 bucks. with the proper tools, a post cat sensor will take about 30 minutes to change. on a 2.3, the left bank pre cat sensor is easy, but you have to remove a lot of stuff to get at it, especially the connector. right bank is about 30 min, too. for 165 each, and 800 for labor, i would change all 4 sensors, all the brakes, oil and filter, trans fluid, brake fluid, coolant, rotate all the tires, and buy a steak dinner for the customer, all in about 6 hours, with a nap in between