Question about 2003 Mitsubishi Montero Sport

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Code po154 what does it mean and what do i do to fix

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  • frank thomas wilson
    frank thomas wilson May 31, 2010

    The left O2 sensor is shorted out or a short in the wiring

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Hi,
The reason for code po154 is that there is no activity detected on the Bank 2 Sensor 1 . But there is also a bulletin that reprograms the computer for a false readout. Basically you need to monitor the O2 sensor action. If it looks in good condition then the reprogram needs to be done. If not, you need to replace the O2 sensor.


Thank you !!


Posted on May 31, 2010

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2003 Chevy S10 Blazer 4.3 V6 with a po154 code for oxygen sensor can someone tell me which sensor it is


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Po174 and po154 what is possible solutions


P0154 - 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of oxygen content of the exhaust. The PCM then uses this information to regulate fuel into the engine and maintain proper air:fuel ratio. It is a four wire sensor, with the PCM providing a reference/signal voltage of about half a volt (0.5v) to the sensor. It usually provides a ground also. The other two wires are dedicated to the oxygen sensor heater element. This heater allows the sensor to warm up faster, which allows the engine to enter closed loop faster, reducing startup emissions. The heater element is supplied a 12v feed from the power distribution center (usually) and a ground.

The oxygen content of the exhaust affects the O2 sensor resistance. This resistance produces a counter voltage on the reference/signal wire that the PCM will use to analyze oxygen in the exhaust. Lean exhaust produces low voltage, while rich exhaust produces high voltage. The oxygen sensor is capable of varying between 0.9v (rich) and 0.1v (lean). Once the engine reaches closed loop, the O2 sensor should begin switching rapidly between rich and lean voltages 2-3 times per second. If for some reason the O2 sensor doesn't switch properly or "sticks", P0154 may set. This code indicates the O2 sensor isn't operating.


P0174 - System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.


If need additional details, just contact us. Hope this helps.

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I have a 98 ford explorer it has code po154 slow response how do i fix it and what caused it


hi, this is an article of po154 interpretation, I think after looking this you can understand the meaning of po154.
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hope help.

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8/2009 computer programming failed, threw a rod and I replaced the engine in my 2001 Nissan Pathfinder. No failsafe mode apparently. I replaced both front O2 sensors and installed a new computer and had...


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Nissan TSB Reference # NTB02-015 (in canada). Might be a similar TSB in the US-also this;

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It does sound like it is an electrical problem, possibly in a harness (damaged) or the ECM had major issues that a reflash could not overcome.

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2003 hyundai tiburon check engine light


You're right, the PO154 has to do with the O2 sensor. The code has the info of Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1).
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No Activity Detected in the circuit could mean the O2 sensor is dead, or an open/cut wire going to the sensor.
That's about all the info you can get out of that code PO154.

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