Question about 2004 Jeep Grand Cherokee

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Code p0159 what is this - 2004 Jeep Grand Cherokee

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  • Jeep Master
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159, (USA?) must be V6 or V8 it has 2 banks.
first google hit
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

let me condense this.
1: the right bank rear 02 sensors is reading wrong,
note I did not say it was bad. dig?
2: this means the CAT on that side, is UNHAPPY.

unhappy can be , as it said air leaks anywhere near the front or rear of Bank 2 CAT.
unhappy 2, is the engine fuel controls are totally out of control
way rich or lean, out of control;
unhappy3, gross misfire, or all the above at once.

the ECU(pcm) at no time ever KNOW what is wrong, it only can flag bad inputs. or tests that fail , tests are called (USA,OBD2 SAE) called Monitors.
do you have a full can tool? or just a near useless codereader.
?

Posted on Oct 15, 2013

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  • Jeep Master
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Hi there:
DTC P0159 - O2 Sensor Circuit slow response Bank 2 Sensor 2

The P0159 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time. Replacing the O2 Sensor 2 usually takes care of the problem.

Pay attention at this possible causes:
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Hope this helps.

Posted on Nov 27, 2013

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Diagnostic-codepo159


code p0159 refers to heated oxygen sensor(HO2S) 2 bank 2 --slow response Same for the oxygen sensor (O2S) ==causes --heating inoperative -wiring--HO2S sensor for the HO2S sensor and for the O2S sensor --wiring and sensor fault.

the HO2s sensors are before the cat convertor and the O2 sensors are after the cat converter.

Aug 14, 2014 | 2008 Ford F-250 Super Duty

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What is the downstream oxygen sensor for, my sebring engine light came on ,and code was 1059- oi/03 ,do i have to get a now


It is hard to say exactly what to do with your problem because the information you posted is inaccurate and incomplete. There is no code "1059" for a 2004 Chrysler Sebring. The only code I could come up with that is even close is code P0159, which is a "slow response" code for a downstream oxygen sensor. If this is NOT the code you are reading, then you should re-post it with the correct code designation EXACTLY like the code reader gives it to you. It would be very helpful to mention also which engine your Sebring is equipped with.

If this IS the code you have, the sensor will most likely have to be replaced. It should be noted, however, that the system needs to be checked for contamination like silicone sealants being used on the exhaust flanges or burning antifreeze or engine oil. If there is a source of contamination and it does not get repaired, it will only cause a new sensor to also fail.

To answer your question about what it does:
The downstream O2 sensors monitor the post-catalyst oxygen in the exhaust system to allow the engine computer to determine if the catalytic converters are in good condition and working properly.

Sep 01, 2011 | 2004 Chrysler Sebring

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My 2004 sedona has little power going up hills, my local machanic says the code( po431) means the bank 2 catyletic converter is bad, but which converter is bank2? also have a code -p01159 which no one...


The answer to your first question is the Oxygen sensor bank 2. Its the oxygen sensor after the catalytic towards the rear of the motor. For the other DTC there is no P01159 DTC, P0159 is Bank 1 Sensor 1 Oxygen Sensor bad, P1159 is an air intake leak or a MAF (Mass Air Flow Sensor leak)

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Gas is being forced out of the fuel tank when the vehicle is running.


A defective fuel pressure regulator (located on the fuel rail) may have blown the gasket on the
fuel pump (located in the gas tank).
Another thing to check - the car's computer may have posted
an error code from the fuel tank pressure sensor.. I'm not sure, but if this sensor shows pressure
building in the fuel tank, rather than let it explode its seals, the sensor may intentionally leak fuel
in order to relieve the internal fuel pressure build-up inside the fuel tank.

On the fuel rail (supplies fuel to the fuel injectors on top of the engine), there will be a Schrader valve,
which is your connection to connect your Fuel Pressure Gauge to your car's fuel rail.
Give it a check, but put a shop rag around the connector as your screw it in - fuel (and fuel
pressure) will leak as you install the fuel gauge.

You may get computer diagnostic codes P0158 or P0159 - see below for interpretation.
Note that the PCM is the Powertrain Control Module, which is the car's computer.
Also "TP sensor" is the throttle position sensor.
---------------------------------------------------------------------------------------------------------------------------------------
Trouble Code: P0158

Meaning: HO2S-22 (Bank 2 Sensor 2) Circuit High Input

Possible Causes:

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

HO2S signal circuit is shorted to system power (B+)

HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits

PCM has failed

----------------------------------------------------------------------------------------------------------------------------------------
Trouble Code: P0159


Meaning: HO2S-22 (Bank 2 Sensor 2) Slow Response

Possible Causes:

Exhaust leak present in the exhaust manifold or exhaust pipes

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

TP sensor element broken (can cause false acceleration event)

Mar 18, 2011 | 2001 Cadillac Catera

1 Answer

Rough Idling with severl codes


SOUND STOP UP FUEL FILTER.WHEN FUEL TANK GET LOW WHEN YOU PUT IN MORE GAS THE SEDIMENT IN BOTTOM OF FUEL TANK GET DISTURB GOES TO FUEL FILTER CLOG IT UP CAUSING LEAN CYLINDERS MISFIRE.

Jul 06, 2010 | 2001 BMW 330

1 Answer

Hi I have a Montero Sport and got a Code P0159 O2 sensor. What needs to be done? Is it not good to drive the suv?


mcdevito75 Here, Your local repair shop should check out this code and repair the problem. Depending on the problem it may not be wise to continue to drive the suv, Safety sake have it checked at your local shop.

May 11, 2010 | 2004 Mitsubishi Eclipse

1 Answer

P0159 is what the read out tells me. Just what do I need to do about this? I turned off the 'Check Engine Light' and it's still off after 2 days. But......!!!


What does that mean? This involves the rear oxygen sensor on the passenger side. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.

Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0159 may mean that one or more of the following has happened:
  • The oxygen sensor is faulty
  • The wiring to the sensor is broken / frayed
  • There is an exhaust leak
Possible Solutions The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the rear passenger side oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
  • Check and fix any exhaust leaks
  • Check for wiring problems (shorted, frayed wires)
  • Check the frequency and amplitude of the oxygen sensor (advanced)
  • Check for a deteriorating / contaminated oxygen sensor, replace if necessary
  • Check for inlet air leaks
  • Check the MAF sensor for proper operation
Related P0159 Forum Topics

Oct 07, 2009 | 2001 Nissan Maxima

1 Answer

I had a p0153 code but now I have a p0159 code on my '04 Suzuki Verona.Where are they located


u hav 02 sensor problems-they r on the muffler manifolds on each side-look like spark plugs with thin wire attached-may be rusted on there but can be worked off with a rench-try cleanin um up-but probly need replacin

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Check engine light is on


P0159 is a 'request" code to check the Trasmisiom Control Module for another code for the TCM sensor codes. you may have to take it to a transmission shop.

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