2005 p0420, p0136, p0156
06-25-16, 01:38 PM
#1
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2005 p0420, p0136, p0156
Hey!
These are the DTCs that pop up. What is also noticable is that acceleration in the 3000rpm range is not smooth and seems like the car is having a hard time speeding up.
P0420 is commonly known, P0136 and P0156 are O2 sensors. I have ordered Toyota Techstream cable which will be arriving soon.
Is there anything you guys could recommend doing first? How do I check if it's the cat that is failing or is it the sensors? Has anyone tried burn off procedures or toyota fuel system cleanings?
Thanks!
These are the DTCs that pop up. What is also noticable is that acceleration in the 3000rpm range is not smooth and seems like the car is having a hard time speeding up.
P0420 is commonly known, P0136 and P0156 are O2 sensors. I have ordered Toyota Techstream cable which will be arriving soon.
Is there anything you guys could recommend doing first? How do I check if it's the cat that is failing or is it the sensors? Has anyone tried burn off procedures or toyota fuel system cleanings?
Thanks!
06-25-16, 08:24 PM
#2
The sign you describe sounds like a failing VVT valve solenoid or plugged cat (among other possibilities).
I would first pull the 02 sensors and bench test them. This can be done with a multimeter set to DC volts in the 2 or 20 Ohm range and a propane torch.
If they check out, then with the access to your OBDII, you can examine the fuel trims to get a more complete picture of what is going on. Eastern Catalytic has a good article on this if you search their site. A cheap $6 Ebay ELM327 bluetooth unit and freeware from Torque can also give you this ability.
I would first pull the 02 sensors and bench test them. This can be done with a multimeter set to DC volts in the 2 or 20 Ohm range and a propane torch.
If they check out, then with the access to your OBDII, you can examine the fuel trims to get a more complete picture of what is going on. Eastern Catalytic has a good article on this if you search their site. A cheap $6 Ebay ELM327 bluetooth unit and freeware from Torque can also give you this ability.
06-26-16, 10:53 AM
#3
Lexus Champion
+1 on checking the fuel trims.
With Toyota Techstream its easier to graph on your laptop than with Torque.
You can also graph your Oxygen sensors there too and see the output.
On my Honda Accord, I fixed a P0420 by using a resistor-capacitor filter (instead of changing the catalytic converter). I'm not sure how applicable it would be for Toyotas, but here's how I did it to give you an idea:
With Toyota Techstream its easier to graph on your laptop than with Torque.
You can also graph your Oxygen sensors there too and see the output.
On my Honda Accord, I fixed a P0420 by using a resistor-capacitor filter (instead of changing the catalytic converter). I'm not sure how applicable it would be for Toyotas, but here's how I did it to give you an idea:
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