Obd code P1131 and PO174

https://www.obd-codes.com/p0132


P1131 Ford Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates...

All of the codes you are getting except for one are indicating a running lean condition. This is most likely due to a vacuum leak or the pintle on the egr valve is worn out allowing exhaust gases to pass through all the time. If you have access to a monitor check the iac duty cycle as well as the dpfe sensor. If the iac is reading less than forty percent you have a vacuum leak. As well if the dpfe is reading above 1.13 volts the egr valve is bypassing. The last code you have is being caused by a faulty thermostat.

PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5

the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty

missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure
sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer

http://www.obd-codes.com/p0147

Hello,
P1131 = Lack of HO2S11 switch - sensor indicates lean, ( upstream heated oxygen sensor )
This oxygen sensor is located before the catalytic converter, ( refered to as UPSTREAM )

P1151 = Lack of HO2S21 switch - sensor indicates lean, ( could be up, or downstream heated oxygen sensor ) " Downstream ", meaning after the catalytic converter.

PO174 = System too lean, ( bank 2 ) The fuel/air mix ratio is bad.

These DCT codes are generally caused by a problem with the emissions system. The following items are a few of the most common items to trigger those codes.

1. Dirty air filter. ( very common )
2. Faulty idle air control valve. ( common )
3. MAF, ( mass air flow ), sensor. ( very common )

All 3 of the above can prevent the onboard computer from determining the proper fuel/air mix ratio.
The oxygen sensors measure to insure the fuel/air mix produces maximum power with minimal emissions.

I hope this helps you.
Feel free to contact me in the comment section if you have a question.

sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.

sounds like a o2 sensor code to me

should idle around 700

Code p1131 manufacturer control fuel air metering, on a 2003 Ford Taurus. Where is part? Is there an easy way to see if it can be fixed without buying the expensive part?

in the center of the motor,in the rear on the fuel rail