SES -- EGR / Coolant Temperature Sender
Well I almost have 'Silver Flash II' running tip top with all my mods -- but as usual, something else happens -- I have been getting an intermittent DTC P0401 EGR Low Efficiency; I stopped and bought a can of cleaner but is it worth it? I found a New Delco EGR Valve on ebay for $70 and went ahead and bought it and cleared the code for now.. and also I popped another code recently for Coolant Temperature Sensor; gauge is reading fine though -- checked the connector .. is that common to go? I went and bought a GM one off ebay for $13 bucks
Do these codes randomly ever mean anything else I should look at? Or anything I could have done to trigger it? I did pull the nosedrive a couple weeks ago for inspect and coupler change, fuel level sensor, intermediate shaft, both O2'* replaced, and Magnaflow CAT install, PCM, and MPS all withing the past couple of months. Checked vacuum lines and all looked excellent and connected.
Gas mileage is averaging 24-26 MPG highway for me as well.
Thanks in advance --