What else can be giving me a P0135 reading on my toyota corolla 2006 model apart from a upstream oxygen sensor malfunction? i am afraid if i buy it there may be another issue. i have diconnected the battery. the code went away now it is back.

copy and paste
https://www.camryforums.com/how-tos/a/toyota-camry-how-to-check-and-replace-o2-oxygen-sensor-396981

https://www.yourmechanic.com/article/p0135-obd-ii-trouble-code-o2-sensor-heater-circuit-malfunction-bank-1-sensor-1-by-jay-safford
https://www.autogenius.info/toyota-camry-2002-2003-fuse-box-diagram/

P0135 code is: Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

This code refers to the front oxygen sensor on Bank 1.

The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.

Symptoms: You will likely notice poor fuel economy the illumination of the MIL.

Causes: A code P0135 may mean that one or more of the following has happened: O2 Heater element resistance is high Internal short or open in the heater element O2 heater circuit wiring high resistance open or short to ground in the wiring harness.

Possible Solutions: Repair short or open or high resistance in wiring harness or harness connectors Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

How to Diagnose a P0135 -Heater
Performance Bank 1 Sensor 1 (GM 3.5L) January 31, 2012 Updated: October 29, 2014 Written by: Abraham Torres-Arredondo Article Id: 371

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If your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor.
A P0135 DTC says: HO2S Heater Performance Bank 1 Sensor 1... and this means that the PCM (Powertrain Control Module = Fuel Injection Computer) has detected a problem with the front oxygen sensor's heater element or a problem in the heater's circuit (wires).
In this tutorial, I'll show you how to check the oxygen (O2) sensor's heater element and the two circuits that feed it with power (10 to 12 Volts) and ground with a multimeter.
In case you're wondering, where the oxygen (O2) sensor that the code P0135 is accusing of being BAD is... this bad boy is located on the exhaust manifold and before the catalytic converter.
To help you navigate this article, here are its main points:

1. Symptoms of a BAD Oxygen Sensor Heater Element.
2. What Tools Do I Need to Test Code P0135?
3. What Does the Heater Inside the Oxygen Sensor Do?
4. Circuit Descriptions of the Downstream Oxygen Sensor.
5. Start Here.
6. TEST 1: Oxygen Sensor Bank 1 Sensor 1 Test.
7. TEST 2: Checking 12 Volts to O2 Heater.
8. TEST 3: Checking the O2 Heater's Ground Circuit.
9. TEST 4: Ohming the O2 Heater Element.
10. P0135 O2 Sensor Heater Test Summary.

Buying a Digital Multimeter for Automotive Diagnostic Testing (found at: easyautodiagnostics.com).

Scan Tool.

1. Don't have one?... check out my recommendation: Abe's Scan Tool Recommendation.

Wire Piercing Probe.

1. Although this tool is not an absolute must, if you do buy one, you'll realize just how easy it makes testing the voltages inside the wires.
2. If you need to see what this tool looks like, you can see it here:Wire Piercing Probe.

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Applies To:

Buick Vehicles:

• Rainier 4.2L
  • 2004, 2005

Chevrolet Vehicles:

• Colorado 3.5L
  • 2004, 2005
• Trailblazer
  • 2004, 2005

3.5L
How To Test for a Blown Head Gasket (GM 3.5L, 4.2L)
How to Test the MAF Sensor and Codes: P0100, P0101, P0102, P0103
How To Test for a Blown Head Gasket (GM 3.5L -FWD)
All Articles: 3.5L "A day without sunshine is like, you know, night"
Steve Martin
MORE TUTORIALS:

The code P0135 means O2 sensor heater circuit malfunction bank 1 sensor 1. This means you most likely have a bad O2 sensor. The possible causes are:

TT - Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM) Usually the code indicates a bad Oxygen sensor, but an intake vacuum leak or a failing fuel pump can cause the code, so check your intake vacuum hose for a leak or hole. But most likely, you have a faulty Oxygen sensor. Now Bank 1 Sensor 1 means the bad O2 sensor is the one on the number one cylinder side (which is the cylinder closest to the timing belt or where all your belts and pulleys are),which is bank one. If you look really closely, you will see that the number 1 cylinder is just a little bit closer to the belts than the number 2 cylinder. Now that you know which side you are dealing with, the next step is which sensor. There are two O2 sensors on each side (upstream or downstream), four total. Sensor 1 is the upstream sensor, which is before the catalytic converter closest to the exhaust manifold. Number 2 sensor is on or after the catalytic converter. So in short, you are replacing the O2 sensor on the Number 1 cylinder side before the catalytic converter. They are a pain to remove. Get some Pb Blaster lubricating oil and spray on the threads and let sit for 10 minutes and spray it again. You will need a 7/8 Oxygen sensor removal socket to remove it. Don't forget to disconnect negative battery terminal and O2 wire harness first.. Any questions please feel free to email me. Good luck.

P0302 TOYOTA - Cylinder 2 Misfire Detectedhttp://engine-codes.com/p0302_toyota.htmlForum CodePossible causes- Faulty spark plug 2
- Faulty ignition coil 2
- Ignition coil 2 harness is open or shorted
- Ignition coil 2 poor electrical connection
- Clogged or faulty fuel injector 2
- Injector 2 harness is open or shorted
- Injector 2 poor electrical connection
- Improper spark plug 2
- Insufficient cylinder 2 compression
- Incorrect fuel pressure
- Intake air leak
P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1http://engine-codes.com/p0135.htmlForum CodePossible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)
Tech notes The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the O2 Sensor 1 usually takes care of the problem
P1705 TOYOTA - Direct Clutch Speed Sensor Circuit Fault.
This is related to the sensor that gives info about the slippage rate o fthe transmisssion to the Transmission Control Module..

code p0135 refers to heated oxygen (HO2S) sensor 1 bank 1 heater control---circuit malfunction===causes wiring--fuse HO2S ---ECM
he brand should not matter as long as it it is a quality unit
what does matter is wire damage from not using the correct socket for the installation process that causes wire damage

You need to follow your exhaust. You have two. One in the front and one in the back. All you do is plug one side into the electrical connector and the other side screws into the exhaust. You need to find out if it is the upstream sensor or downstream sensor before you change that one. The one in front is upstream.

p0135 indicates bank 1 sensor 1 which is before the cat.

P1133 HO2S Insufficient Switching - Read Our Article On Oxygen Sensor Codes For Help With This Pontiac Trouble Code (check your oxygen sensor also called O2 sensor)

All the codes you have listed come back and refer to the oxygen sensor. I would say that it is your problem. you vehicle may have 2

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You have a broken wire at the connector for the 02 sensor. the brake may be inside the shielding.