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Sport track 4.0 surges and occasionally stalls at idle as if the tps were faulty.I scanned it and got code po191, fuel rail pressure sensor. I replaced the sensor and it ran great for about 400 miles and started back doing the same thing again. I scanned it again and the results were codes po191, p2198,p2196 andp2271. The thing is that it doesn't do it on a regular basis, its sporadic

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Well, the O2 sensors indiacte they are rich from time to time, which implies they are defective. However, since the fuel pressure sensor is indicating out of bounds signals, I suspect the fuel pressure regulator is defective. Unfortuantely, that thing is part of the fuel pump assembly in the fuel tank. I assuem yours is a 2010 model (you didn't say.) O'Reilly wants about $250 for a new pump assembly. The fuel tank will have to be dropped to access the top of the tank where the pump is located.

You should have the fuel pressure measured at the fuel rail on the engine to see of it is within spec. Likely it is not and a new pump will be in order. Sorry!

Posted on Dec 03, 2014

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If you used professional scan tool software, you could look
at the data & maybe figure it out

You can google the codes & read up

All the codes have to do with lose of fuel control & a rich condition

The TPS even with a problem, would not drive your fuel trim so
rich your getting all those O2 Sensor Codes

Look at data
Look at fuel trim
Look at fuel pressure
Look at O2 Switching
Look at TSP Data

Check for vacuum leaks

You could have a lean condition & the fuel system is driven
rich-- thus the rich codes

The 2271 is lack of switch or front to rear bias (only one side- out of range)
There you have to resolve any vacuum leaks,fuel
trim issues,maf issues,ignition problems,etc, then address
the oxygen sensors & converter

I called a lincoln dealer a couple years ago for someone
on here & they had only used or sold 3 or 4 fuel pressure
regulators across all vehicles in their bays, in a 5 year period

So that may never have been the issue
The code who knows,it's a ford

I have seen 6 or more codes on a misfire & hardly any
had anything of value to use or was even related

Install new spark plugs every 3 years
Only use the factory tip config ( OE style plug)
Measure the center electrode & get it right

Install Front O2 Sensors now & every 100,000 miles

Check for vacuum leaks ( use an Evap Smoke machine)

Both banks are effected,so that tells you something, if you have
a vacuum leak or else you have a MAF problem,doubt it

Posted on Dec 03, 2014

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Posted on Jan 02, 2017

dhorsefield
  • 286 Answers

SOURCE: have a 2007 ford 500 wont start shows codes po191

P0191 is Fuel Rail Pressure Sensor "A" Circuit Range/Performance
P2196 and P2198 are lean bank 1 and lean bank 2. You normally show lean bank codes if the air-fuel ratio is not correct. The most common cause is a hole in the hoses between the PCV valve and the intake on the motor (back of the motor generally). The fuel rail pressure sensor code could either be caused by the vacuum leak or by a failing fuel regulator. I would first check for holes in the rubber hoses especially where there are right angle rubber hose connectors. Look for soft squishy or oily spots on the hoses.

Posted on Aug 14, 2010

  • 15 Answers

SOURCE: Just replaced fuel pump on 2000 mercury mystique

four bolts and the injectors and two hoses. not to bad one to two hour job at most.

Posted on Oct 11, 2012

  • 5341 Answers

SOURCE: 99 f250 v10 auto 4x4-cat converter imploded,

The fuel pressure sounds too low. Is it multi-port injection? Check the fuel pressure against your specs for the car and engine. MPFI systems usually require 40-50 psi.

Posted on Apr 16, 2013

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