How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
Type Your Cadillac Question Here...
Dave Nova is online now
A new question is answered every 9 seconds

EGR Flow ckt range/perf P0404 Code 01/02 & 02/02

Customer Question

EGR Flow ckt range/perf P0404 Code 01/02 & 02/02

What the deal???

I need to keep sending money with no real answers???

April 2009 was told a test would be send after paying more $'s.

I need to pay more just to get answer to my 1st question again!!!

This site is a scam!!!!!!

Gonna report to FTC, BBB and anyone else I can!!!

Submitted: 7 years ago.
Category: Cadillac
Expert:  Randall C replied 7 years ago.
Hello, I was working with you the first time. I looked at that post and asked what diagrams you want and if to send. You really did not repsond correctly to that question but added a bonus instead. I am sorry you are upset but the last post timed out. I will see what i can do to help you now. the site is not a scam, this was a communication problem. You will not have to pay more $. Unsure if i can help but where are you with the car now. what codes? 404?
Customer: replied 7 years ago.

After I asked my machanic to replace two "used" O2 sensors...

I have only these two codes: EGR Flow ckt range/perf P0404 Codes 01/02 & 02/02

Both my machanic and myself agree I will probably get more codes.

I stopped driving the Cadillac now.

Next week, I will install a new EGR valve that I ordered this week.


Customer: replied 7 years ago.

I am still having problems with my '97 Deville.

Now, I have P0300 after replaing a new EGR Valve....

Expert:  Randall C replied 7 years ago.
Code 300 is "random misfire" everything you have come up with as far as codes etc are tellingme you have a vacuum leak somewhere. try unplugging the egr completly and see if the engine smooths out. You could have vacuum leak at egr gasket now. If engine is running rough, a vacuum leak is more than likely present setting the 300 code as well as too lean and triggering all the o2 codes as well.