Question about 2004 Kia Sorento

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04 kia sorento runs poorly

Bank 1 runs lean bank2 rich, fuel pressure key on is 50psi. no codes stored . checked fuel injectors, 16 ohms and all drop same ammount of fuel when doing a manually injector drop test with special tool. timing belt installed correctly with marks aligned. Changed o2 sensors bank 1 sensor1 and swap with bank 2 sensor 1 no change. If spray choke cleaner in throttle body o2 counts will increase above 450mv if you spay alot. normal condition the o2 count will stay close to 0mv bank1 sensor 1 and2. Changed both convertors , know engine is tour down to the crankshaft sensor. Should i replace it or look a something else?

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  • MatHew
    MatHew Mar 05, 2014

    I have a cr doing the same thing! Did you end up fixing it?

  • Anonymous Mar 13, 2014

    where is bank 1 sensor 1 o2 sensor


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Might be going super simple here but from what you have said have you checked the wiring on your sensors? If you know that one works and you swap it and its not working its very possible the wires farther up are shorted or burned somewhere.

Posted on Dec 12, 2008

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Proton Wira P0170 P0172

code p 0171 refers to system too lean bank 1===causes ---intake / exhaust leak---AIR system---MAF/VAF sensor ---fuel pressure / pump/ regulator--injectors---heated oxygen sensor (HO2S)
code p 172 refers to system too rich bank 1====causes ---intake blocked ---EVAP canister purge valve ---fuel pressure --- EGR system--- injectors---HO2S
as the HO2S is in both codes , check/ replace it as it reports to the ECM for air /fuel mixture settings and if faulty it can set to too lean or too rich or swap between the extremes

Nov 02, 2016 | Proton Cars & Trucks

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Replaced o2 sensor bank 1 sensor 1, now reading "Circuit Low Voltage Bank 1 Sensor 1" and P0154 on Bank 2 Sensor 1. Live readouts on both show avg of .48V. What is wrong?

Lets examine your readings first.
Code 154 means the sensor is not switching from lean to rich enough in 60 seconds. And there is no such thing as average voltage.
The O2 sensors generate their own voltage by measuring oxygen in the exhaust. They also have heaters that get power from a relay.
But a problem with the heaters should be a different code.
When the engine is running, the computer varies "on" time for the injectors based on engine temp, throttle position, and unburned fuel in the exhaust. So when the O2 sensors send voltage higher than .5 to the computer, the computer calls that RICH and shortens on time for the injectors. Then when the O2 sensor drops voltage down below .5 it reads LEAN, and the computer lengthens on time for the injectors.
This back and forth switching should happen several times each minute. Like the tick tock of a clock.
If the sensor(s) are slow to switch, or they stay on lean or rich for more than 30 seconds, you get the code 154. Each sensor has a different code for the same issue.
It could be a sensor problem, or a fuel problem, or something else.
Too lean can be low fuel pressure, too rich can be not enough air flow coming into the intake.

Apr 19, 2016 | 2000 Chevrolet Silverado 1500

1 Answer

2002 eord F150 po174 system adaptive fule too lean bank2

PO174- too lean bank two --is a possible rich
condition driven lean by the pcm

Check for leaking injectors,vacuum leaks,fuel pressure

Look at fuel trim on scanner

The front oxygen sensors get replaced every 100,000 miles,
so there may be some of the problems

Start with fuel trim,cylinder misfires,spark plugs, injectors, on that
bank, as a place to do your testing for the code

Look at freeze frame data & I/M Monitor activity, to see if the O2
Monitors ran clean & look at O2 data

Mar 09, 2014 | 2002 Ford F150 Regular Cab

1 Answer

I have an '04 Tahoe with the 5.3 L engine. The check engine light came on so I had it coded with a diagnostic computer. Bank one & two detect fuel trim issues (rich or lean air/fuel ratio). Both say...

check the fuel pressure as if this is not correct then this can cause a problem, check running pressures and volume and also check driving pressures as it could be an intermitant problem. then you don`t say if both bank codes were set at the same if so then maf sensor and possibly a problem with injectors could be a problem. but you have to get the codes checked at the time they set and drive around for 1 week or more or you won`t know for sure.

Jan 31, 2014 | 2004 Chevrolet Tahoe

1 Answer

Cylinder misfire spark

how many miles on the odometer, mines 95k.
ah a v6, P0306 is #6 misfiring. 2.5L V6
300 is all 6 misfiring.... oops.
it is. for sure.
misfire is cause by many things, only 3 in physics, but many real world. (compression + spark +fuel rates)
i works this easy, way.
i have a full scan tool not just a code reader (near useless it)
i make sure my V6 (I have an 04) holds closed loop at idle and 2500 rpm. i f not , fix that first.
easy, it is. just look, bingo, Open loop, (out of control)
fueling is out of control.
but, first i do that tune up. in the manual, 60k , 120k, 180k, see?
do that first. , spark plugs dont last foreever nor filters.
then i replace both front 02 sensors at 100k miles. there design life.
V6 has 2 front sensors. (rear can , just sit and be ignored)
if it misfires. now, i toss a coin.
compression or fuel pressure.
i can do both in 30min flat but i toss coin lands on fuel.
i check fuel pressure and its.
60psi, fuel regulator is bad,
20psi, same, or bad pump or bad 12vdc to pump, 8v to pump is bad wiring.
one thing that helps is to find out if the engine is running too rich or too lean.
and if there are cracks in the exhuast near the 02 sensors.
i force the EFI rich and lean watching both 02 sensors in my scan tool
to see if i can force them lean or rich.
on the v6, we can introduce air leaks, to the plenum.
this will cause lean, and the o2 most react to my lean forcing
or its dead.
i can force richer, if i suspect lean or 02 shows lean, by
removing the Fuel pump regulator hose (vac) and plugging hose fast.
this causes the FPreg to go to high pressure. max.
causing RICH>
i watch the 02 and see it go rich, if not the 02 is bad or you have exhaust leaks, or dead cylinder causing the 02 to fib.
you have 2 banks, and both banks are running off 1 MAF
so you can look at both 02 sensors (front) B1S1 and B1S2
and see if both react the same. to my forcing's.

i dont think you have 3 bad cops out 6. no.
if any cylinder misfires on bank one, then bank 1 o2 goes nuts
same with the Bank 2. this can aid troubleshooting having 2 banks.
the MAF can not lie for 1 cyclinder nor one bank
the 02s can lie for each bank,
both are key to diagnosis.
let me give an example say
injector 1 leaks.
causing 301s
135 left
this is your lay out.
my guess is its not lost compression (no test guess, mostly useless)
not 2 bad cops one on each side will cause 300s
not one bad cop. as other side would be ok.
not one bad injector.
my guess, is fuel pressure is way off.
or maf running lean (dirty, spary clean it 12inches away not close)
low fuel pressure
too high fuel pressure.

all comments are for engine with 60k mile service done,
60k, 12ok, etc.

Jan 13, 2014 | 2002 Suzuki Grand Vitara

1 Answer


oxygen sensors are not the one who controls your speed however it will monitors your engine how it runs or if thre should be a looses power .if the sensors bank 1 and bank2 received a rich or lean is indicated that you need to check the spark plugs, fuel filter
fuel pump, or the vacuum hoses air flow meter, map sensors,fuel injectors which are need to check to fix the problem...

Sep 06, 2013 | 1996 Ford Explorer

1 Answer

System lean bank 1 p0172 fuel

PO 171 Bank 1 too lean
PO 174 Bank 2 too lean
Why ?
The front O2 Sensors need to be replaced at
100,000 miles or sooner, if they have actually failed
They are reading too lean because the system is too
rich & the computer is driving the fuel trim or injector
pulse lean, thus the codes or failed sensors, yes both
Have to check fuel trim with a scan tool
Have to check fuel pressure
Have to check there are no leaking injectors
Have to check for Vacuum Leaks from the intake
all the way to the exhaust converter
Your working a rich condition keeping in mind the system
is driven lean
You look at fuel trim short & long,sort of a past history
of events
May want to look at converter temps also
The converters won't last long if you have or has
a rich condition from fuel or cylinder misfires
Now the spark plugs can't be over 3 years old
& no mifires,get that out of the way before working
the O2 issues

Jul 27, 2013 | 2005 Mitsubishi Endeavor

1 Answer

P0131 sabb 93 2001 po121 error codes

P0131 - O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 (sensor is before the catalytic converter)

Possible causes- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
P0132 - O2 Sensor Circuit High Voltage Bank 1 Sensor 1
Possible causes- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

I am not really sure what is going on here with the same O2 sensor giving these lean and rich codes, if nothing else is apparent and the engine runs well you may have a defective O2 sensor.

Sep 13, 2012 | Saab 9 3 Cars & Trucks

1 Answer

I have a 1998 ford contour that has codes p1130 and p1131 on it what could be the problem. the check engine light is on

    Diagnostic Trouble Codes (DTCs) P1131 bank 1 (Cylinder 1) and P1151 bank 2 indicate the fuel/air ratio is correcting rich for an overly lean condition. The HO2S voltage is less than 0.45 volt. DTCs P1132 bank 1 (Cylinder 1) and P1152 bank 2 indicate the fuel/air ratio is correcting lean for an overly rich condition. The HO2S voltage is greater than 0.45 volt.
    DTC P1130 and P1150 indicate the fuel control system has reached maximum compensation for a lean or rich condition and the HO2S is not switching.
    DTC/HO2S Reference List
    • HO2S-11 = DTCs P1131, P1132 and P1130
    • HO2S-21 = DTCs P1151, P1152 and P1150
    Possible causes:
    Fuel system
    • Excessive fuel pressure.
    • Leaking fuel injector(s).
    • Leaking fuel pressure regulator.
    • Low fuel pressure or running out of fuel.
    • Contaminated fuel injector(s)
    • Vapor recovery system
    Induction system
    • Air leaks after the MAF.
    • Vacuum leaks (vacuum lines and gaskets).
    • Restricted air inlet.
    • PCV system.
    • Improperly seated engine oil dipstick.
    EGR System
    • Leaking gasket.
    • Stuck open EGR valve.
    • Leaking diaphragm.
    Base engine
    • Oil overfill.
    • Cam timing.
    • Cylinder compression.
    • Exhaust leaks before or near the HO2Ss.
  • 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.

Feb 12, 2011 | Ford Contour Cars & Trucks

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