My car is using oil and the garage cannot find the reason. on 2005 Saturn Ion

This all started when my check engine light came on. The oil was down by a quart. Since it was time for an oil change, that was done. Now it has only been 200 miles since that, and the check engine light came on again and it is down a 1/2 quart. I also have had the knock sensor replaced twice. That is also still showing a problem. My fuel gauge is also showing some problems. I was advised to take it to the dealer to see what they can find. My car has now 102,000 miles on it.

by in New Freedom, PA on August 29, 2013
2 answers 5 comments
ANSWER by on August 29, 2013
The oil level is NOT the reason the yellow check engine light is on! You have two seperate problems. Mechanic needed, to find oil leak or consumption problem. Then the mechanic can scan the computer to find out why the check engine light is on! (or vice versa)
COMMENT by on August 30, 2013
I first had my car looked at by Brooks and Huff. They ran a diagnostic and it came back showing a problem with the knock sensor and fuel gauge. They could not locate why the oil was being use or where it was going. They recommend I take it to the Chevy dealer who deals with Saturn's to see what they can find.
COMMENT by on August 30, 2013
That is probably the best thing to do since the dealer has access to the latest repair info. Which independent shops do not! Hope they can fix your car for you,
COMMENT by on September 05, 2013
I have since taken my car to a Chevy dealer and they rebooted the computer system that deals with the "check engine" light. This has solved that problem. As far as the oil, they told me to keep a check on it. I could have the oil system cleaned and resealed. They said this sometimes solves the problem and sometimes not. The approximate cost for this would be $150.00.
COMMENT by on September 06, 2013
I AM LEARY ABOUT "HAVING THE OIL SYSTEM CLEANED AND RESEALED". IF NO LEAKS ARE FOUND, YOU MAY HAVE A FAULTY PCV VALVE. THIS VALVE IS USUALLY LOCATED ON THE VALVE COVER OR SOMETIMES ON THE INTAKE MANIFOLD. IT PROVIDES A CONTROLLED VACUUM LEAK TO RELIEVE PRESSURE FROM THE CRANK CASE. IF THE VALVE IS STUCK CLOSED, IT CAN CAUSE OIL LEAKS DUE TO INTERNAL PRESSURE; IF IT IS STUCK OPEN, THE ENGINE WILL NOT RUN NOTICEABLY ROUGH BUT IT WILL TEND TO REMOVE OIL VAPOR FROM THE ENGINE AND SEND IT TO THE INTAKE MANIFOLD WHERE IT WILL BURN OFF IN THE CYLINDERS. THIS IS MOST LIKELY THE CAUSE OF THE CONSUMPTION AND IT IS A RELATIVELY CHEAP PART TO TRY. I WOULD RECOMMEND YOU GO TO THE DEALER AND REQUEST REPLACEMENT OF THE PCV VALVE AND SEE HOW IT GOES.
ANSWER by on August 29, 2013
PUSHROD IS CORRECT; A LOW OIL LEVEL WILL NOT CAUSE YOUR CHECK ENGINE LAMP TO ILLUMINATE. THE KNOCK SENSOR AND FUEL LEVEL SENSOR WILL ILLUMINATE THE LAMP DEPENDING ON THE NATURE OF THE MALFUNCTION. HOWEVER, NEITHER OF THOSE ITEMS WILL CAUSE NOR WILL THEY BE AFFECTED BY A LOW ENGINE OIL LEVEL. SO YOU ACTUALLY HAVE THREE SEPARATE PROBLEMS BUT SINCE YOU ARE CONCERNED MOST WITH THE OIL LEVEL, LET'S TALK ABOUT THAT. HAVE YOU NOTICED ANY OIL ON THE GROUND WHERE YOU NORMALLY PARK? DO YOU SMELL ANYTHING OR SEE ANY SMOKE AROUND THE VEHICLE WHEN THE ENGINE IS WARMED UP AND RUNNING? (THIS WOULD BE EASIER TO NOTICE IF YOU DRIVE THE VEHICLE 10 OR 15 MILES, THEN PARK SOMEPLACE OUT OF THE WIND. SMOKE WOULD TEND TO BE VISIBLE UNDER THE HOOD OR ANYPLACE ALONG THE EXHAUST SYSTEM UNDER THE CAR. ANOTHER QUESTION I WOULD LIKE TO ASK YOU IS IF THE VEHICLE HAS BEEN IDLING ROUGH OR POSSIBLY HIGHER THAT NORMAL. IF THIS IS THE CASE, YOU MAY BE ABLE TO FIX IT YOURSELF FOR NOT A LOT OF MONEY.
COMMENT by on August 30, 2013
Thanks for your response but the answer is "no" to all of your questions.