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What is the meaning of these codes p1258, p0304 ,p0174

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,p0171 Cadillac deville 2003 Thank you allan...
what is the meaning of these codes p1258, p0304 ,p0174 ,p0171
Cadillac deville 2003
Thank you allan
Submitted: 9 months ago.Category: Cadillac
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Answered in 2 minutes by:
9/25/2017
Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 9 months ago
Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 5,675
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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Hi Allan, good to speak with you today.

P0304 is a cylinder #4 misfire. P0171 and P0174 are lean exhaust indications, generally meaning that you have a vacuum leak to find and repair. And P1258 tells us that the engine was recently overheated to a very high temperature, 268F to be exact, and this is there just to tell the tech that the engine was overheated, but doesn't tell us anything more than that.

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Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 9 months ago

All of these things combined, if you were to ask me for my educated guess, point to a head gasket failure, likely at cylinder 4. The lean exhaust can be and probably is a stand alone issue, pointing to a leak in the air intake or something like that, but the misfire and overtemp codes are much more important at this point.

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Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 9 months ago

I see that you are seeking a second opinion, but it doesn't appear that you have read this thread yet, just wondering if you had questions about what I said above.

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