Question about 2004 Mazda MPV

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CHECK ENGINE CODE P0157 WILL NOT CLEAR: O2 Sensor was replaced. Both the Catalytic converter and the sensor are testing good, but the code will not clear. It keeps coming back. How do I permanently clear this code?

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Posted on Apr 17, 2014


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Posted on Jan 02, 2017

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SOURCE: Check engine light.

ok the bank 1 is where the cilinder one is get a firing order and see where is the number one cylinder that's the bank one
then follow the exaust and replace the sensor after the catalitic
or converter

Posted on May 29, 2008

  • 1 Answer

SOURCE: My car is having difficulty

I have the same problem, I replace the O2 sensors and nothing??????? I have no idea what to do to take care of the problem. I have just ordered a new and improved throttle body. according to the Mazda6 forum, the throttle body on the 03 model was junk. I'll keep you posted.

On a side note, I was transferred to Richmond, VA for Columbus, OH about an 8 hour drive. I have driven back and forth about 4 times with the check engine light on and have had no problems. my email is if you find a solution please let me know and I will do the same.

Posted on Jul 27, 2008

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SOURCE: p2196,pcm replaced,o2 sensor replaced,maf replaced,engine

the most cause of it :-
o2 sensor
fuel pressure
fuel injectors
air intake restricted

check for that and ask me for more information
with my best wishes

Posted on Jul 31, 2008

  • 3 Answers

SOURCE: code c1277 (steering angle sensor)

this vehicle uses a steering control module and the antilock control module. Both modules get a signal from the steering angle sensor. We found that the steering module didnot show a steering sensor code but the ABS module did show the code.
after checking that the wiring was intact and with good continuity, it was determined that the fault lies in the ABS module.
A new ABS module and configuration confirmed the diagnosis. It's fixed!

Posted on Aug 07, 2008

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SOURCE: I have a 2004 Mazda

It can be hard to say which it is, because either one will trip the the code, but in this case I'd place my bet on it being the O2 sensor because it says "warm up" - the O2 sensor has to be up to temperature (around 900 degrees) to function. The computer watches for the O2 sensor to heat up in a certain amount of time, and if it doesn't get to temperature soon enough, the computer diagnoses a faulty heater for the O2 sensor and trips the code.

For the record, this would be the secondary O2 sensor, the one after the cat. That's the one that is used to determine cat functionality and efficiency. The primary sensor, before the cat, is used to fine-tune the fuel delivery.

Posted on Aug 08, 2008

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Code P0157

OBD II P0157 due to Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2)
This code refers to a fault in the post-catalyst o2 sensor on Bank 2. First, a basic run-down of the catalyst: The Catalytic Converter is used to help control tailpipe emissions, to "clean up" the exhaust, if you will. The PCM (Powertrain Control Module) uses the signal from the heated oxygen sensor to the rear of the catalyst to monitor the catalyst's efficiency by comparing it to the o2 sensors in front of the catalyst.

Read more at:

P0157 O2 Sensor Circuit Low Voltage

Mar 11, 2016 | 2007 Honda Odyssey

1 Answer

Code p0420 acura m'dx

1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes: Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Diagnostic Help:
To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. The front reading should vary, the rear should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component concerns. See our article "Automotive Circuit Testing 101", if you need more assistance with this. Remember to refer to an model-specific repair manual for proper instruction.

Jan 20, 2014 | 2005 Acura MDX

1 Answer

I have a 2007 dogde charger and my check engine light is on. I get codes P1005, P0158, P0157 and P0128. I am not sure what these mean or what to do about them can anyone help?

P1005 is model specific, Dodge is a problem with the manifold tuning valve.
Code 158 and 157 are for a problem with the O2 sensor for bank two after the catalytic converter.
Code 128 is for a problem with the thermostat or the engine is not reaching normal temp.
The O2 sensor codes could be caused from the manifold valve or they could be caused by a faulty O2 sensor.
I would start with the coolant temp problem and work back.

Mar 01, 2013 | 2007 Dodge Charger SE

1 Answer

Location of oxygen sensor bank 2 sensor 2 for gmc sierra 1500 v8

Bank 2 is the bank that is farther back than the other when looking at eng from the front you will see that one cyl head is farther forward (closer to radiator than the other. this is #1 Bank) #2 is the opposite and sensor #2 is the one after the Catyliac Convertor towards the muffler. #1 sensor is between head and Cat.

Feb 07, 2012 | Cars & Trucks

2 Answers

Fault code P0420

This Code means your Catalytic converter is not working like it should. You may have a problem on Bank 1 or the O2 sensor is giving you false readings. At a minimum you should either replace or have the O2 sensor tested to verify that the Catalytic converter is working properly.

If the O2 sensor is accurately performing its job, then have the engine scoped before replacing the Catalytic converter.

You should have received a defect Code for other components which could foul the Catalytic converter. This is why I recommend getting the engine scoped. If other defects were corrected before you purchased this vehicle, then the Catalytic converter may be able to recover by itself.

The Converter costs so much that you should verify things like low compression on the number 1 bank.

Jan 27, 2012 | 2002 Oldsmobile Silhouette

1 Answer


Both codes indicate a a low voltage on the post catalytic converter O2 sensor
Check the wiring to the sensor.
An exhaust leak could also cause these codes to set

Any of the following issues can cause the codes to set
Most likely is a bad connection or faulty O2 sensor
  • Air leaks in exhaust in front of o2 sensor giving false reading
  • Engine running excessively lean
  • O2 sensor connector damaged/corroded
  • O2 sensor signal circuit is shorted to ground
  • O2 sensor ground circuit is open
  • O2 sensor has failed (it may be contaminated with fuel or coolant)
  • PCM has failed

Aug 03, 2011 | 2003 Kia Sorento

2 Answers

Need to pass emissions test, dianostic test - Catalyst efficiency blow threshold (bank 1) tried to order part - now I need to know if it pre or post, left or right Oxygen sensor, can it be determined by...

Yes it can be determined by the DTC (Data Trouble code). If the DTC is P0420 (catalyst system efficiency below threshold Bank-1) then the side of the engine with the #1 spark plug and cylinder is always Bank-1, and the O2 sensor that monitors the catalyst efficiency is usually after or (post) of the catalytic converter.

The #1 cylinder is located at the front spark plug on the right or the passenger side of the vehicle, so Bank-1 is on the right side of the vehicle, and the O2 sensor that monitors the catalyst efficiency should be located after or (post) of the catalytic converter. It would be the post right O2 sensor.

There is also the possibility that the catalytic converter is actually starting to fail, and if changing the O2 sensor and clearing the DTC does not solve the problem them the catalytic converter is most likely faulty.

Aug 12, 2010 | 2002 Jaguar X-Type

1 Answer

Po137/po157 codes no activity

P0137 / P0157-Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

A code P0137 may mean that one or more of the following has happened:

Faulty o2 sensor Exhaust leak near the rear sensor
Plugged catalyst
Short to voltage on O2 signal circuit
High resistance or open on O2 signal circuit

Possible Solutions…
Replace faulty sensor
Repair exhaust leak near the rear sensor
Check for restriction in catalyst and replace as necessary
Repair short, open, or high resistance on o2 signal circuit

Mar 08, 2010 | 2000 Chevrolet Camaro

1 Answer

Service engine soon Light On code says o2 sensor but replacing didn't fix it

There are two O2 before the catalytic converter and one after. The one before is the one the ECM uses to control engine controls and the one after is there to verify the converter is working. if the converter stops working properly that can set off the O2 sensor error. It is possible that the catalytic converter could be the problem and not the O2 sensor. Or the O2 sensor that you replaced might not be the defective one. Also the check engine light might not go off right away after replacing the sensor. It may take some time of driving. The ECM needs to get a good reading from the sensor for sometime before the code will dissapear. So it is possible that you might have repaired the problem and the code has not cleared yet. You could clear the code by disconnecting the battery for about 10 minutes and then see if it comes back.

Jan 08, 2010 | 2003 Chevrolet S-10

1 Answer

Code po157 what does it mean and how do i fix it?

P0157 Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2)

I would try replacing the Oxygen sensor, then clear the code.

The O2 sensor would be the after the catalytic converter ( sensor 2) on the exhaust pipe of the number 2 cylinder uses ( bank 2).

May 18, 2009 | 2001 Mitsubishi Galant

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