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I have an engine light on for P0404 EGR performance. it is intermittent but becoming more frequent. But i also have a leaky head gasket. It’s not bad. only a slight film of oil on top the coolant, and a slight amount of coolant consumption. very slight i only have to top it off every 3 to 4 months, and the oil i loose about a quart every 3,500 miles. so at this point it’s not bad enough for me to care about it just yet. The problem is i can’t pass safety inspection with that engine light on. granted its intermittent so i was able to pass this time since it was off. But i probably wont be so lucky next time. and when that engine light is on it goes into a closed loop fail-safe which kills my fuel economy. The problem i face is, this car isn’t worth the money it will take to fix the head gasket. So i am just going to drive it till it quits. But i need that Engine light fixed for the sake of safety inspection. So i want to know if a leaky head gasket can trigger an EGR code or if this is likely two separate problems. Because i am willing to fix an EGR. i am not willing to fix a Head gasket. the car just isn’t worth the repair cost.
its a 98 Camaro V6 3800 series 2 150,000 miles
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I don’t think a bad head gasket will cause the EGR code. Someone will correct that if it is wrong. How do you know it is your head gasket that is bad? Do you have blue smoke come out the exhaust? The head gaskets on these engines are pretty rock solid. As for your oil leak, have you checked your valve cover gaskets? Those are prone to leaking on the 3800.
I’d start by testing and cleaning your EGR valve. Also, I believe a bad gas cap can set this code (a bad gas cap can set random emission codes because the pressure in the system won’t be correct)
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