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Discussion Starter · #1 ·
2012 Nissan Sentra “Black Edition”
I want to start off by saying I do not know much about these cars and I’m older school when it comes to mechanical knowledge(not much knowledge on computer side).

The codes being thrown are
P0131
P0138
P0037

The upstream 02 sensor and downstream 02 sensor have both been replaced. Also the MAF sensor has all been replaced and is still throwing these 3 codes. I’m at a loss and don’t know what else to change. After changing the parts the code came back with 15 miles or less.

Any help would be appreciated.
 

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Inspect the two 10 Amp fuses that's in the IPDM for sensor #2 (downstream). Inspect the engine ground point connections for tightness and oxidation. Test the fuel pressure by tee-ing a temporary fuel pressure gauge between the fuel feed hose and the fuel rail. The readings at idle should be 51 psi. You may have dirty fuel injectors; run some good injection cleaner, like BG products 44K, through the system; give the cleaner about a week or two to do it's job.
 

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Inspect the two 10 Amp fuses that's in the IPDM for sensor #2 (downstream). Inspect the engine ground point connections for tightness and oxidation. Test the fuel pressure by tee-ing a temporary fuel pressure gauge between the fuel feed hose and the fuel rail. The readings at idle should be 51 psi. You may have dirty fuel injectors; run some good injection cleaner, like BG products 44K, through the system; give the cleaner about a week or two to do it's job.
Equipment for checking the fuel pressure ?

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