Question about Oldsmobile Alero

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What would give a check engine light and antilock brake light but when checked with a scanner it comes back as no codes found ? its an oldsmobile alero

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Are you sure its the "Check engine" light and not the "service vehicle soon" light. They are quite different. Only the check engine light will set a code, either current or history. The ABS will also set a code, but will also illuminate the service vehicle soon light. Aleros are notorious for bad front wheel bearings, which contain the wheel speed sensors for the ABS system. They also have issues with the wiring harnesses going to the wheel speed sensors. Have the front wheel bearings checked for excessive play first, then I would suspect the harness, especially if the lights tend to come on more so when its raining or wet out.

Posted on Apr 06, 2011

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How to check antilock brake system


If you mean check the system for trouble codes, you will probably need a professional scanner to access the computer. A regular engine code reader will not work.
On some models in the 1990s you could make the ABS light flash the codes but I think that was before 1995.

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as you know there is an antilock brake electrical problem. traction control is part of the abs system and the lights will come on at the same time. Unfortunately you will need to get the trouble codes from the antilock brake controller. this can only be done with a very expensive scan tool. there are too many possible problems to be guessing. If you go to your local shop they will probably give you the trouble codes for about 75 dollars or less then I could possibly be of more help to you.

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1 Answer

Why are my service vehicile soon lite,brake lite, antibrake lite, and change oil lites on after i start car


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3 Answers

Changed brakes, checked fluid and checked senors and fuse all ok but the ABS light is still on! Why?


The only way to know for sure why your Antilock Brake light is on is to scanyour Antilock Brake Module and retrieve the fault code that has set and turned the light on. If you have not accessed the Brake Control Module and checked the data, I don't know how you could have possibly "Checked the sensors". This data MUST be accessed to see if the module is recieving the signal from the sensors in order to know if the sensors are good. If you have done this, then you should have also recieved the fault code to let you know what the problem is. You cannot scan your vehicle with a generic OBD code reader to get ABS information. You must have a scanner that has a data interface for accessing the Control Area Network (CAN) on your vehicle.

Feb 27, 2011 | 2000 Chevrolet Venture

1 Answer

My traction control lights keep coming on, and then my car says that the engine power is being decreased, and i'm on dry surface


That is your Antilock Brake/Traction Control computer going into what I call "False antilock mode" This is almost always caused by abad wheel speed sensor. Your vehicle is equipped with 4 of them. To diagnose this problem, you must drive the vehicle with a scanner hooked up that can read the wheel sensor data and find out which wheel sensor is not working properly. Sometimes (but not always) you get lucky and the Antilock Brake Control Module will set a code to tell you which one.

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1 Answer

Security abs Brakes and low coolant lights stay on while car is running but the check engine soon waits a few seconds and comes on and stays on. But car runs fine


These warning lights are often on due only to bad sensors and not due to bad systems. If your ABS brakes still pump themselves, for instance, you Antilock brakes are still working even tho the light is on. Whenever the check engine light is on it means that you will get error code messages about what the problems are by scanning the car's computer. If you have an AAMCO repair shop nearby drive there as they will scan your computer for free. Some auto parts stores also scan for free so call around. J.

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1 Answer

Brake problem


your antilock brakes are activating. i would suspect one of your wheel speed sensors is acting up. (showing 0 mph while moving). need to get a scanner on it and monitor the wheel speed sensors, suspect you will see one reading 0 usually at lower speeds.

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1 Answer

ABS, Service Engine Light


This is normal for your anti-lock brakes to quit when the abs light is on.What you will need to do is retrieve the codes and then you can find out what part of the abs system is giving you the problem.This will also cause the check engine light to come on.You can post back and I can help you with the code or codes that are in the brake control module.Hope this helps.

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1 Answer

Warning lights on


You will need to go to your local garage or local Auto Zone to have you codes that are stored retrieved and let us know if we can be of any assitance.

Oct 10, 2009 | 2001 Oldsmobile Alero

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