What to do about Check coolant level light, code P0174, hissing noise and power steering noise?

JNEALMOSTGIFTED

MEMBER
2002 CADILLAC DEVILLE
94,000 MILES

The reservoir has enough coolant but I still get the light after driving about 15 min, I hit info reset and it goes away. I received the codes p0171 and p0174. I cleaned the MAF and gave the car a fuel treatment and the service engine soon light went off. Several days later the light came back on and I got the p0174 code. I haven't replaced the oxygen sensor yet. Wonder if there is something else I could do. Also, sometimes the engine putts a little when in park or stopped.

Wednesday, October 19th, 2011 AT 10:06 PM

1 Reply

FACTORYJACK

MECHANIC
4,159 POSTS

More than likely you have a faulty coolant level sensor in the reservoir(part of). On the lean codes, highest probability is that you have a split in the boot between the throttle housing(aluminum), and the plastic intake. It usually splits in the rubber, on the lowest portion, not viewable until removed. You may also have a higher than normal idle speed as another symptom. The plenum boot is serviced by replacement.

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Thursday, October 27th, 2011 AT 2:42 PM