GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

P0174 Code - comes and goes?

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Old 03-15-18, 05:47 PM
  #16  
vijayn
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hahaha thats great!
Old 03-23-18, 09:09 AM
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Tofubento
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Well, that fixed it for all over 4 hours. Then I noticed the idle started to get rough...and check engine light. Same code.

Though, while waiting for the part, I found out running my air conditioning stops the check engine light from kicking over.

So ,I am now at a complete loss as to what is causing this. With new gasket and everything torques to spec all the numbers where right on scanner. From long and short fuel, as well as the sensors.
Old 03-23-18, 06:02 PM
  #18  
vijayn
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Thats frustrating aye.
Are you able to get a capture of the live data, long term fuel trim and all oxygen sensor voltages now? Or are they same as the ones you posted above?
Also did you check around the exhaust manifold and exhaust pipe near the oxygen sensor if theres any leaks/holes?
Old 03-25-18, 11:20 AM
  #19  
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same as above, but ill double check it.

no leaks that i could see or hear.

I think I am going to just need to take it to a shop at this rate.
Old 04-02-18, 10:19 PM
  #20  
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So problem solved...intake manifold gasket blew...and when I had the dealership replace my knock sensors...they never torqued the manifold down properly. The bolts where finger tight. Finger bloody tight.
Old 04-03-18, 01:36 PM
  #21  
vijayn
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Man even the experienced guys (Lexus) get it wrong sometimes. Hard to trust them to do a good job aye.
Old 04-15-18, 05:23 PM
  #22  
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Yup, and finally call...its been a week or so...and no issues at all. It was the manifold gasket, so happy its fixed.
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