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Old 03-27-2014, 09:22 PM   #1
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Service Engine light on

Yesterday I had my service engine light come. Chassis is a W22. Stopped at a Chevy dealer to check. He hooked up a plug in diagnostic tool and said it might have been moisture in gas or loose gas cap. Problem wasn't the gas cap. He said it was probably OK to drive. He reset it. Light has come back on but everything seems to be running fine. Anyone had this problem and driven with the light on? Anyone carry these diagnostic plug in tools with them. How much should I expect to pay? Where get them?

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Old 03-27-2014, 09:35 PM   #2
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Had a similiar problem last summer in AK while on a caravan tour - need to read the error codes in more detail to uncover what is causing the check engine light to come on - my problem was Mass air flow sensor, O2 sensor, air filter and fuel filter replacement - now has run flawlessly since last summer's repair in Anchorage -

Key is to find a knowledgeable shop who can interpret the error codes and advise correctly -

I have a 2003 Pace Arrow, 37 A with 8.1 Vortec and WH chassis -

Let me know if you need any further details --

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Old 03-27-2014, 10:38 PM   #3
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Do you have the diagnostic trouble code # or description?
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Old 03-28-2014, 07:13 AM   #4
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No, I did not get the diagnostic trouble code # from the tech. He just reset it and I was on my way. My fuel filter was replaced in 2012. I have your Ultra Power system and I clean and replace the air filter every year.
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Old 03-28-2014, 07:31 AM   #5
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I bought a scan gauge and it will read those codes. Remember this. A code will be set when something occurs that only affects the emissions output on the engine. That could be a fouled spark plug. A bad plug wire. If a vacuum line becomes disconnected. If any one of several sensors malfunctions. There could be many reasons. Now lets just say that you knocked a plug wire off the code got set but you re-connected the wire. If the reason the code was set does not happen for approximately three starts then the code will usually erase and not reset.

You stated that the code was erased but it reset. So the reason for setting the code has not been fixed. It may or may not cause any serious problems. Several auto parts houses will read those codes for you for free. Get it read again only this time write down the code. Then you can google the code and determine what is causing the problem. Don't take it to a repair facility until you have a better handle on what might be causing the problem. You might be able to fix it yourself.

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Old 03-28-2014, 11:18 AM   #6
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Consider picking up one of these.

Amazon.com: LYLŪ Elm327 WIFI Wirless OBD2 Car Diagnostic Reader Scanner Scan Tool for Iphone iPad iOS PC: Automotive

They work great and will give you a clue as to what is going on without having to go pay a mechanic.
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Old 03-28-2014, 12:24 PM   #7
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I had a 2002 Chevy TrailBlazer that the check engine light kept coming on because of a bad seal on the gas cap. I replaced the seal, and everything was fine.
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Old 03-28-2014, 04:08 PM   #8
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Went to Sears & bought a unit to check. Got codes: PO134 and PO353.
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Old 03-28-2014, 04:41 PM   #9
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Do a Google search, looks like oxygen sensor and ignition system.

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Old 03-28-2014, 04:45 PM   #10
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Is it missing? The PO353 is a circuit malfunction on the #3 cylinder coil. My guess is that, like my TrailBlazer, you have individual coils at each spark plug. This code should mean that the one on cylinder 3 is bad. You may try swapping the coil on #3 with one on a different cylinder and see if you get a different code for a failure on the cylinder you put the "bad" coil on. The PO134 is an O2 sensor issue that may be a result of a misfire. If you have a bad coil and replace it, the other code may not return.

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