my check engine light come on & off on my 2011 srx what is the problem i had auto zone check code an it was p o 171 &p o 174 how do i fix it

Asked by May 02, 2016 at 07:55 PM about the 2011 Cadillac SRX Luxury

Question type: Maintenance & Repair

I had auto zone check the code they are p o 171 & p o 174 how do I fix it

2 Answers


The P0171 combined with P0174 code, it's likely that the problem is caused by an intake leak. NO intake leaks, the next step is to check the air filter and clean the Mass air flow meter. If the issue remains HEGO (front) oxygen (O2) sensor(s) may need to be replaced.


Yes, those are classic codes for a vacuum leak. Check all your hoses and gaskets. You can have a smoke test performed to find it faster than a visual inspection.

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