Check engine lights on 99 ford ranger ODB codes 3- need solutions before in shop takes me to the bank help #1- P1506 #2- P1131 #3- P0171 I already know what they mean, got them written down. Need clues on how to self fix

I need year--make--model, the first code is for 02 sensor bank 1.
The second code a lean code for bank one. Did you use a gage and check proper fuel pressure. How long since a tune-up?

bank 1 sensor 1 lean code. Check vacuum lines first. Could be egr leak also. Most vacuum lines run on the back side of the engine on these. Most common fail is the PCV 90 degree elbow. On the passenger side.

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2


p1131 p1151 p0171 p0174 p1131 p1151 p0171 p0174
All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This engine is known for vacuum leaks, so before you start throwing oxygen sensors at the problem, it pays to perform some diagnostics.
Start by cleaning the MAF sensor. Spray the sensor with CRC MAF sensor cleaner. Next, check the plastic vacuum lines, especially where they meet with rubber boots. If they are cracked or the rubber is swollen, replace the line. Then check the rubber elbow that holds the PCV valve. That elbow is a know failure point. In fact, the entire PCV tubing is a trouble spot on these engines. (thanks Ford).
After you've checked for vacuum leaks, check the operation of the oxygen sensors. The easiest way to do that is to disconnect the sensor from the harness. Connect one lead of your digital voltmeter to the black wire on the sensor and the other lead to battery negative. Then start the engine and add fuel (either propane, starting fluid, or carb cleaner) into the throttle body to force the mixture to rich. You should see a corresponding increase in voltage as you add fuel (from 0 volts to slightly less than 1 volt). Start and stop the fuel enrichment and watch the meter to see if the volts drop as you stop adding fuel. If you see no change, the sensor is dead. Replace it.
You can also use the fuel enrichment procedure to locate intake gasket leaks.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
P0174 system lean bank 2
P0171 system lean bank 1


This is the only info that didn't come back directly to FORD (yet still mentions it) instead of GM. Not to sure you got the correct code.

Hi Donna,here's a link to your code. P0171 Ford Fuel Injection System Too Lean Bank 1 .Here's a video. How to Diagnose OBD II Fault Codes P0171 and P0174 Leaking Intake and...

P1131 - Insufficent Switching 02 Bank 1 Sensor - 1 Sensor / Lean.

Sensor 1 on bank 1 is the passenger's side upstream 02 sensor.

Start by cleaning the MAS and Filter and see if this helps. If not, you will probably need to replace the O2 sensor.

It COULD also be a bad No.2 injector I believe

P1131 FORD - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
This code is usually caused by a defective Oxygen sensor in cylinder bank one of your engine. Cylinder bank 1 is the bank of cylinders that contains number 1 engine cylinder.

Hi hope I can help.
P0171 mean bank 1 is to lean
P0174 means bank 2 is lean
You did not state what engine you have but by your codes you must have the V6 4.0.
These codes refer to a fuel issue. bank 1 and bank two represent each of your manifolds.
being you have a V6 you have 2 manifolds.
Each of your manifold have an O2 sensor in it. That's what is giving the lean reading.
This does not mean that you have bad O2 sensors.
They are just doing there job.
So you should check your fuel pressure with a gauge and make sure your pressure is correct.
It seams as your fuel pump maybe weak.
Hope this helps.
Please leave feed back
Thank you urnuts73@ FixYa

Hi, 1151 is an 02 sensor code, 1131 is also 02 sensor code,
0174 lean condition bank 2, and 0171 is lean bank 1. Either this is in need of a whosale of repairs or you have computer issues, From looking at the codes i would first do a complete tune up, Including wires, And inspect for a vacume leak before replacing any 02 sensors..
Take care

P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

P0171 - system to lean - bank 1 try this address and it should explain what you need to know...(There is probably some stuff that doesn't apply though)...upon further research I've seen many people pointing to a bad o2 sensor causing this code to appear so that may be the issue.
http://www.tankota.net/repair/Repair_Manual/03tacoma/di/eg2rzfe3/cip0171p.pdf
hope this helps.........Good Luck!