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Old 02-28-2009, 11:33 AM
s31248 s31248 is offline
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2002 SL2 EGR Problem

I was getting a P0404 EGR fault code so I took the EGR valve off and cleaned it. The pintle wasn't too bad and it didn't seem to be stuck, but I could not move it when I pushed down on it. Once it was clean, I put it back on and started up the car. I hooked up my OBD2 scanner (a very basic one) and cleared the fault. After driving it around for 20 minutes, the fault did not come back. I checked the live data and found some differences from last time I looked at the live data. Here is what seemed different:

Fuel SYS1 = OL, driCL, using HO2S
Fuel SYS2 = OL, driCL, using HO2S
SECOND AIR = Error

Can anyone help me with what is going on? Is this normal? How do all the other values look (I am attaching the photos of the scanner)? I took this data at idle sitting in my driveway, the engine was warm.

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Old 02-28-2009, 01:47 PM
RC1488 RC1488 is offline
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Re: 2002 SL2 EGR Problem

Your in Open loop (OL) fuel delivery. That's because your thermostat is stuck open. You should be at 195F at operating temperature. Once in closed loop, fuel delivery is based on the O2 Sensors. OEM thermostat from the dealer only (20 bucks).

Also, your Secondary Air Injections system is cloged. Youll soon get a P0410 im sure.

Follow this and clean the passages ways out. Usually they are clogged with carbon :http://www.youtube.com/watch?v=dIrmkxj6wJE
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