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DTC P0452 - Fuel tank pressure sensor- low voltage Possible causes:Faulty fuel tank pressure sensor open/short in wiring harness between pressure sensor & VCMFaulty VCM
Below is diagnostic testing for both codes. You need to address DTC P0452 code first. In order to do full testing in order to determine problem you will need a DVOM(digital voltmeter) and a level 2 diagnostic scanner.Most of the testing can be done with the DVOM.
I strongly urge doing the diagnostic troubleshooting before replacing parts. It can just as easily be a short/open in wiring as a faulty part.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
Possible causes
- Harness or connectors (EGR volume control valve circuit is open or shorted.) - EGR volume control valve stuck closed - EGR volume control solenoid valve - Dead (Weak) battery - EGR passage clogged - Exhaust gas leaks
Possible solution
- Clean EGR Valve - Repair EGR harness or connector - Replaced EGR volume control solenoid valve - Replaced EGR volume control valve Code P0171- Fuel Injection System Too Lean Bank 1
Possible causes
- Intake air leaks - Front Heated oxygen sensor may be faulty - Injectors may be faulty - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Mass air flow sensor may be faulty - Incorrect PCV hose connection
Possible solution
Dirty air filter of faulty air flow sensor are common causes of the problem
P0174- Fuel Injection System Too Lean Bank 2
Possible causes
- Intake air leaks - Front Heated oxygen sensor may be faulty - Injectors may be faulty - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Mass air flow sensor may be faulty - Incorrect PCV hose connection
Possible solution
Dirty air filter of faulty air flow sensor are common causes of the problem.
Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.
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