Cupertino Auto Repair

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Cupertino, CA 95014

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Topic: Diagnostics

TPMS (Tire Pressure Monitoring Systems) Ignorance
Thursday, June 19th, 2014

It is SO very important to have the correct tire pressure to avoid potential overheat of the tire, and also for best gas mileage. Most drivers probably do not associate “overheat” with tires, but if the pressure is too low, the tire gets hot and actually can come off the wheel. If this happens at high speed, it can be a very dangerous situation for the driver, passengers and others sharing the road.

Posted by maryp at 10:30 am Read Comments (0) Print this Page Email this Page

Check Engine Light – Concern, Cause and Correction
Wednesday, February 26th, 2014

You may not realize it, but there are over 600 items that could trigger your check engine light to illuminate. It can be a simple fix.  However, in some instances, it may also be complex to get to the cause and correction.
The mystery of diagnosing your check engine light is one that is not easily understood by many vehicle owners. The commercials running non-stop or popping up on your screen are not helping to educate anyone, either.

Posted by maryp at 10:54 am Read Comments (0) Print this Page Email this Page

Basic Function BMW VANOS System
Tuesday, July 3rd, 2012

Internal parts of the VANOS

Ahh… the mysterious VANOS of your BMW engine.

VANOS for timing was used beginning in 1994 with a single VANOS. This particular picture is a duel VANOS unit that is used in models years 2000-2003 in M5’s and Z8’s.
The VANOS has the ability to adjust the valve timing which improves the engine power dynamics and reduces the tailpipe emissions. It optimizes the camshaft angle for all ranges of the engine operation, as both intake camshafts, and exhaust camshafts are continuously adjusted to the optimum.

Posted by maryp at 9:35 am Read Comments (0) Print this Page Email this Page

What Does Check Engine Light Mean
Wednesday, May 9th, 2012

Example of engine light in BMW 3-series

Help! “Check Engine Light” was on, but I drove for a while and now it’s off. What’s with that?
Your MIL light, (Check Engine Light, also called Service Engine Soon light in some BMW years/models), turns on when a fault, (Diagnostic Trouble Code aka DTC) is detected related to emissions and your OBDII(Onboard Diagnostics, second version). It is about clean air.

Posted by maryp at 2:14 pm Read Comments (1) Print this Page Email this Page

Bad Alternator or Battery Might Stall Your Car
Wednesday, April 6th, 2011

Having a tow driver “fix” your BMW is like asking the person driving you to the hospital to diagnose your appendicitis attack! Think about it.
Your BMW or MINI won’t start and the battery seems like it has died. Now what?
It is time to check your battery for state of charge, and state of health. Age of the battery is also a consideration and should be recorded at your shop. If your battery is OK, it is now time for a complete charging system check which includes:

Checking belts,
tensioners,
pulleys,
test of the starter (initial and cranking) and the alternator performance (voltage and amperage output,
diode stator condition and voltage regulator control and voltage),
and parasitic drains.

Posted by maryp at 7:56 am Read Comments (0) Print this Page Email this Page

Diagnostic Codes: Tech Diagnostics vs. Self Diagnostics
Saturday, August 7th, 2010

You have probably heard of the term “pulling codes”, or “reading codes”. The codes are initiated by your BMW or MINI by it’s very own “self diagnostics”.
There is a fallacy out there in the general public; that all a tech has to do is to “plug something into” your BMW or MINI and that a computer will easily tell the tech what is wrong. Part of this misconception may be from the tons of commercials from big box automotive places advertising their pulling codes for free, with some guy holding the little scan tool and making it look simple and easy. But, let’s look at the bigger picture.

Posted by maryp at 10:10 am Read Comments (0) Print this Page Email this Page