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Old 10-24-2012, 08:05 AM   #1 (permalink)
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Default 2006 Forenza P0420 and P2135

Hello to all.
I have pulled these codes and was wondering if anyone can help me through the diagnosis. I had originally purchased a catalytic convertor online to fix the P0420, but the convertor is in great shape. I read different posts saying the P0420 can be caused by the P2135. My scanner showed this may be the case. I also read about some wiring concerns could be the issue, or an oil soaked rear cat monitor. Here is what the scanner showed:

Codes Pulled:
P0420 = Catalyst efficiency below threshold bank 1
P2135 = Pedal position sensor switch A/B voltage correlation

P0420

DTC that caused this freeze frame: P2135

Throttle Position = 15.6 Percent
Engine RPM = 786 RPM
Barometric Pressure = 97 KPA
Load Valve = 37.6 Percent
Map Sensor = 36 KPA
Coolant Temperature = 177 Degrees
Intake Air Temperature = 64 Degrees
Ignition Timing Advance = 0.0 Degrees
Short Term Fuel Trim 1 = 0.0 Percent
Long Term Fuel Trim 1 = 3.4 Percent
Short Term Fuel Trim 3 = -100.6 Percent
Long Term Fuel Trim 3 = -100.6 Percent
Vehicle Speed = 0 MPH
Absolute Load Valve = 28.0 Percent
Fuel System 1 = Open
Fuel System 2 = N/A
Relative Throttle Position = 6.2 Percent
Commanded Throttle Actuator Control = 8.6 Percent
Absolute Throttle Position B = 15.6 Percent
Accelerator Pedal Position D = 9.8 percent
Accelerator Pedal Position E = 4.7 percent
Commanded Evaporative Purse = 0.0 Percent
Commanded Equivalence Ratio = 0.896
O2S1111 = 0.915v
O2S1211 = m0.915v
O2Sxx11 = 0.915v
Short Term Fuel Trim 11 = 0.0 Percent
OS2 1112 = 0.620v
OS2 1212 = 0.620v
OS2 xx12 = 0.620v
Short Term Fuel Trim 12 (BX-Sys) = 99.2 Percent
Distance Since Codes Were Cleared 100 Miles
Fuel level Input 94.9 Percent
Control module Voltage = 14.054

Thanks in advance for any help given. John
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Old 11-05-2012, 10:30 AM   #2 (permalink)
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Default Answer

This is a bogus site. People don't really respond to posts, so don't even write one. What a waste of time and energy.
I researched on my own. Since the scanner said that the p0420 was triggered by the 2135 code. It is safe to assume that the cat convertor is good. Mine was of normal color and the substrate is intact. The only thing I was worried about was the possibility that is could be wiring or the actual accelerator pedal assembly.
The mechanic at Suzuki was kind enough to give me this info. ($20) Take a look under the hood at the throttle body. At the front of the t-body there should be a blue or green dot to show that the t-body was already replaced/updated. If there is no dot. Buy one. I got a discounted price of $315, plus a gasket and add tax. I installed the new t-body. Then I removed the battery cable, stepped on the brake and turned on the head lights with the battery disconnected. This erases all trans shift memory and t-body tp position memory. Reconnected the battery and road tested. The trans shifted weird for a while. After it learned it's new strategy. It went through it's tests and now passes the emissions test. Thanks to no one on this web site. They do have every emoticon under the sun though. Hope this helps.
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Old 11-05-2012, 11:35 AM   #3 (permalink)
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Welcome to the forum and Sorry no one answered your post. with the hurricane here (NYC) internets been a little Sketchy. I personally own an 05 Reno with out the drive by wire system so I wouldn't have been much help but Your post might really help someone in the future who has the same issue. These days a lot of people just just sign up to have a question answered so theres more people with questions than answers lolol. The regulars come on less frequently. I check a few times a week to see what's going on. If you run into another problem, have a question, looking for something whatever post up. The only major difference in the years is the drive by wire system almost anything else I can try to help with and the moderator is really knowledgable too. what really helps is a post like yours that's full of info to help others. I hope your not so mad you'll leave the forum.
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Old 07-11-2013, 12:09 AM   #4 (permalink)
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Quote:
Originally Posted by Simphead View Post
This is a bogus site. People don't really respond to posts, so don't even write one. What a waste of time and energy.
I researched on my own. Since the scanner said that the p0420 was triggered by the 2135 code. It is safe to assume that the cat convertor is good. Mine was of normal color and the substrate is intact. The only thing I was worried about was the possibility that is could be wiring or the actual accelerator pedal assembly.
The mechanic at Suzuki was kind enough to give me this info. ($20) Take a look under the hood at the throttle body. At the front of the t-body there should be a blue or green dot to show that the t-body was already replaced/updated. If there is no dot. Buy one. I got a discounted price of $315, plus a gasket and add tax. I installed the new t-body. Then I removed the battery cable, stepped on the brake and turned on the head lights with the battery disconnected. This erases all trans shift memory and t-body tp position memory. Reconnected the battery and road tested. The trans shifted weird for a while. After it learned it's new strategy. It went through it's tests and now passes the emissions test. Thanks to no one on this web site. They do have every emoticon under the sun though. Hope this helps.
I thought the code was for either the catalytic converter or oxygen sensor. Did you replace the oxygen sensor? If not, what did you do to fix the problem for the P0420 code?
I have the same code, although I also have the codes 700 and 705.
Would you happen to have the part number for the T-body?
Thanks,
Vickie
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Old 07-11-2013, 12:27 PM   #5 (permalink)
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I know this is an old thread but maybe this will help someone else down the road.

Do the drive by wire ones not have 2 cats like my 2005 does? One under the car and one bolted to the exhaust manifold? If the car is misfiring it doesn't take long to mess up the one by the manifold. I had a P0420 code it was thefront cat breaking aapart. I replaced it with a $150 aftermarket bolt in one and it has been good for the last 3 months. There's not a lot of traffic here (never has been in my experience) so don't get too upset if you don't get an answer quickly.
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Old 07-11-2013, 12:40 PM   #6 (permalink)
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Hi! The p0420 code is catalytic system below operation threshold somehing like that. The 700 and 705 have somehing to do with the Transmision control system and I think 705 is the transition range sensor. There's a possibility it might just be your range sensor causing the issues.
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