Question about 1994 Ford Ranger Supercab

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Runs rich on bank one and lean on bank 2 changed computer new iac 2new o2 sensers newtemp sensor new mass flow super cab 4x4 4.0 liter

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Have it checked for compresion you may have a head gasket problem are any of the plugs green on the tip

Posted on Dec 09, 2009

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2 Answers

2010 f-150 signal stuck lean bank 2 sensor 1


It could be the sensor, or a fuel mixture problem for that side.
A mechanic would use a scanner to watch the data flow on that sensor while making that side run rich.

Feb 23, 2015 | Cars & Trucks

2 Answers

Van stalls intantly- misses bad if I give it gas.. Changed intake gaskets, both o2 sensers, cleaned MAF senser,and changed fuel filter.. Codes read bank 1&2 lean.. Only thing I can think of next is...


It could be a weak pump. To check, have your fuel pressure checked to see if it is correct for your vehicle. On mpfi, pressure should be around 50 psi-check the requirement for your particular vehicle. Then look to the injectors.

Apr 09, 2013 | Cars & Trucks

2 Answers

Codes 177 and 188 appear what should I do to fix this?


CODE PO177 O2 SENSOR RICH BANK 2. CODE PO188 FUEL SYSTEM LEAN LIMIT PART THROTTLE BANK 2. CHECK FUEL PRESSURE YOU HAVE LEAN FUEL SYTEM CAUSED BY A STOP UP FUEL FILTER OR WEAK FUEL PUMP. AND REPLACE O2 SENSOR.

Feb 23, 2011 | Mercury Sable Cars & Trucks

2 Answers

1999 ford ranger 4x4 4.0L motor is skipping replaced camshaft sensor,crankshaft sensor,new coil pack,new plugs,wires,and replaced mass air flow sensor,now its still skipping and codes pulled are showing...


P1151 means a lean bank 2 O2 sensor
P1152 Means a rich bank 2 O2 sensor
P1309 Means miss fire detected
I would check your fuel injector for fouling
When they foul the will develop a drip
Causing a fuel fluctuation that will have O2 sensors reporting rich and lean voltage changes
This causes the pcm to adjust injector pulses making them shorter and longer.
causing more fuel or less fuel.
From this condition you may see plug fouling.
Also check for leaking or faulty fuel pressure regulator or restricted return line.
Most of the time it wont be a bad O2 sensor the O2 sensor is just doing its job.
You also have already changed the plugs and Map so there already out of the way.
If this helps please give me some feed back
Hope this works for you FixYa

Jan 29, 2011 | 1999 Ford Ranger SuperCab

2 Answers

1999 gmc yukon obd11 codes po101 po171 po174 po429 what could be the causes


ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor

Sep 24, 2010 | GMC Yukon Cars & Trucks

2 Answers

Code 171 and engine light is on


--BANK 1 = DTCs P0171 (lean) and P0172 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

Good luck and keep me posted.

Oct 21, 2009 | Chevrolet Colorado Cars & Trucks

4 Answers

Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?


those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

Sep 16, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Check engine light


It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.

May 05, 2009 | 2005 Ford Focus

2 Answers

PO174 HOW TO CLEAR THE CODE


P0174 is SYSTEM LEAN BANK 2. If you do not have any rough running or missfires. Check for any vacumm hoses that may be damaged or loose. Any code that is set on OBDII has to be cleared with code reader. If you have any rough running or mussfires, check fuel injectors for proper operation. If this helps, please rate.

Apr 30, 2009 | Ford Mustang Cars & Trucks

1 Answer

Buick lesabre nightmare 2


  • The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

Jul 31, 2008 | 1992 Buick LeSabre

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