Question about 1999 Saturn SL

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EGR Valve, O2 Sensor

Ok, so my engine light came on awhile ago. Diagnostic said it was a problem with my 02 sensor. I drove with it for awhile (2-3 months) knowing that a faulty 02 sensor wouldn't kill me. Recently I replaced it. I went into the shop to have my codes reset and there was 3 O2 codes and one EGR code. I thought that possibly the O2 sensor being broken was the reason the EGR code was triggered and with a new 02 sensor, I would be fine. The engine light stayed off for a few days but came back on. Now it's saying I have an issue with my EGR valve. Do I need to replace it, or clean it, or is this an electrical problem? What is my best bet here in solving this issue? Also, will a faulty EGR valve cause my gas mileage to be very poor and cause other performance issues with my car?

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Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.

Posted on Jun 06, 2009

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Yes a bad egr valve can cause rough idle. Most of the time the egr valves stick on that model. If you take the egr valve off and turn it over you will see a small opening and a pintle which looks like a torx head bolt. Try pushing on the bolt and most of the time a faulty one will stick open. It sould move freely. On those there is no way of cleaning them you just replace them. Hope this helps.

Posted on Sep 24, 2008

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I had the same problem, and I must disagree, I removed it and used choke/carb cleaner and screw drivers plus a little O-ring pick set of like hooked and sharper tools to scrape it clean and spray it, and scrape it and so forth. She is back to driving like a champ. i have a 1999 Saturn SL2 Manual. I am making a youtube video of the fix, I'll post its link when its up. 

Posted on Feb 26, 2009

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