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Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 31357
Experience:  Automotive Repair Shop Manager, Technician
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Check engine light came on after oil change. Can this happen?

Resolved Question:

I went to a reputable service center to get an oil change. When I got home the engine light was on. How could this have happened? Are there any correlations? If so, how or what could have caused this? I have a 2002 Mercury Sable, less than 55,000 and have never had any problems until now.

Submitted: 9 years ago.
Category: Ford
Expert:  Eric replied 9 years ago.

Hi,
The check engine light (CEL) comes on when the computer detects a fault or problem with a component or sensor in engine driveability, transmission, or emissions system. In order to find out where the issue is the computer needs to be read with a diagnostic scanner. Autozone, along with other parts stores will provide this service for free. They will give you the diagnostic codes that are stored in the computer and what it relates to.
About the only way it would be related is if they knocked a sensor connection loose while changing the oil filter. You can take it back to them first to have them make sure they didn't knock a connection loose, if they don't find anything, then take it to an Autozone for them to read computer for free.

Eric and 4 other Ford Specialists are ready to help you
Customer: replied 9 years ago.

A diagnostic test was run on my car at the Ford dealership and I provided you with the codes in my correspondence. If a sensor connection got loose while changing the oil filter, what corrections could be made to rectify this issue?

Expert:  Eric replied 9 years ago.

Hi,
I re-read your question, but I don't see any codes. If you could give me the codes, I can let you know if it is related to the oil change.
If a connector is knocked loose, it would just need to be plugged back into the sensor.

Customer: replied 9 years ago.

The following codes were quick test P0175 rich bank 1, PCM per SSM 17434.

Expert:  Eric replied 9 years ago.

Hi,
That code, 175- system too rich - means that an oxygen sensor is reading a rich condition in the exhaust gases. A rich condition means that the fuel-air ratio is too much fuel, more than normal. This can happen for a number of reasons, none of which would be from a oil change though. You will need to have a diagnostics performed to determine problem. But that is definitely NOT related to an oil change.

Customer: replied 9 years ago.

Ok thanks! Does this mean that the gas I purchased was bad. I always fill up my tank and this has never happened. What are the chances of me filling up my gas tank and this engine light coming on again? I plan to fill up my tank again today.
Also where is this sensor in connection with the oil filter? and what does the PCM per SSM code 17434 mean?

Expert:  Eric replied 9 years ago.

Hi,
I don't believe its from bad gas. The oxygen sensor is located on the exhaust system, one at the exhaust manifold, one after the catalytic converter. Neither are near enough to the oil filter to have been knocked loose. As far as the other, I haven't any data on that code.

Customer: replied 9 years ago.

I have always filled up my tank and this has never happened. What are the chances of me filling up my gas tank and this engine light coming on again? I plan to fill up my tank again today.

Expert:  Eric replied 9 years ago.

It should not be an issue, unless you don't tighten your gas cap all the way. That can set the check engine light, but its a different code than 0175, usually a code 440 or 442.

I hope this helps. If light comes on, make sure gas cap is tightened all they way.

Customer: replied 9 years ago.

Last question. What would happen if the oil level was filled too high on my dip stick and the oil did not run on the ground? What kind of malfunction or experience would I encounter from the performance of my vehicle?

Expert:  Eric replied 9 years ago.

If oil level is too high, it can cause oil to be pushed past PCV valve and your exhaust would be bluish-blake, a sign of burning oil. Also, in the long run it can cause damage to engine pistons. If the oil is too high, take it back to where oil change was done and have them drain the excess and ensure that oil is at proper level.

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