Question about 2005 Toyota Corolla

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2005 Corolla P0420Did live data; oxygen sensors B1 S2 varied between .195v and .800vB1 O1 varied between 3.161v and 4.209v but stayed mainly around 3.2 to 3.3v I did the "bang" test on the cat and it does not appear to be broken up; any thoughts?

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If you have a scanner try doing an active test on a/f control. Switch the injection volume between +25% and −12.5%, then read the A/F sensor and oxygen sensor voltages. If both sensors react then they are not the issue. Your O2 sensor should vary .4v - .6v and your a/f sensor should vary 3.0v - 3.35v. The A/F sensor output has a few seconds of delay. The heated oxygen sensor output has 20 seconds of delay at maximum. Otherwise is could be an exhaust leak.

Posted on Jun 28, 2009

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Where is O2 sensor located?


They are located on the exhaust system, one is before the catalyst and one after. If it is a v6 or a v8 it will have 4 o2 sensors. If your codes read sensor 2 it means the one after the catalytic converter.

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P0172 and P0175 after replacement of cats and rebuilt injectors


Possible solutions include: Inspect all vacuum and PCV hoses, replace if necessary Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect fuel lines for cracks, leaks, or pinches Check the fuel pressure at the fuel rail Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced. Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

Read more at: http://www.obd-codes.com/p0175
Copyright OBD-Codes.com

Sep 23, 2015 | Cars & Trucks

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Corolla 2005 Engine light on (Error code P0140). I have read that the transmission should not be functioning OK but my car is doing the shift smoothly. The light goes on and off with a few days period. Is...


P0140 - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

Possible causes- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
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Dec 07, 2012 | 2005 Toyota Corolla

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2002 Mazda MPV P0172 and P0300


-25 LFT? your dealing with a fuel injector that is leaking or not atomnizing, Inspect the fuel pressure vacuum line is fuel coming out of the pressure regulator?

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My beetle is just flat-out not running right. It sputters while idling and sometimes it just won't go when you press on the gas. When there is some sort of precipitation in the air, snow/rain etc, the...


ok first off what engine does it have 1.8 turbo,1.9 turbo diesel, 2.0 gas......there are several things to check : mass air flow sensor, oxy sensors B1 S1 and B1 S2 , a bad throttle angle sensor will do this too..give me this info and i can help you better..

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2 Answers

Where is bank 1 sensor 2 oxygen sensor located?


The bank 1 sensor 2 sensors are always oxygen sensor located behind the cat converters, the A/F ratio sensors are always in front of the cat in the exhaust manifold, the part number for the sensor B1/S2 is 89465-09290 from Toyota. Thanks.Helpmech.


Nov 12, 2010 | 2002 Toyota Sienna

1 Answer

How to replace the oxygen sensor


Removal & Installation Upstream HO2 S1 To Remove:
NOTE: If the engine temperature is lower than 120 °F (48 °C), the HO2 S1 sensor may be difficult to remove. Excessive force could possibly damage the threads in the exhaust manifold.
  1. If necessary remove the fuel injector cover.
  2. Disconnect the HO2 S1 sensor electrical connector.
  3. Using an oxygen sensor removal tool carefully remove the heated oxygen sensor.
To Install:
  1. Coat the threads of the oxygen sensor with anti-seize compound
  2. Install the HO2 S1 sensor. Tighten the HO2 S1 sensor to 30 ft lb (41 Nm).
  3. Connect the HO2 S1 sensor connector.
  4. If removed, install the fuel injector cover.
Downstream HO2 S2 To Remove:
NOTE: If the engine temperature is lower than 120 °F (48 °C), the H02 S2 sensor may be difficult to remove. Excessive force could possibly damage the threads in the exhaust pipe.
  1. Raise and safely support the vehicle.
  2. Disconnect the H02 S2 electrical connector.
  3. Using an oxygen sensor tool carefully remove the H02 S2.
To Install:
  1. Coat the threads of the H02 S2 with anti-seize compound.
  2. Using an oxygen sensor tool install the H02 S2. Tighten the sensor to 30 ft lb (41 Nm).
  3. Connect the H02 S2 sensor electrical connector.
  4. Lower the vehicle.
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Oct 07, 2010 | 2001 Buick Regal

1 Answer

1999 avalon , check engine light ON, code P1155 02S


Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

#2 sensors are always oxygen sensor located behind the cat converters, the A/F ratio sensors are always in front of the cat in the exhaust manifold, the part number for the sensor B1/S2 is 89465-09290 from Toyota .

Mar 03, 2010 | 1999 Toyota Avalon

1 Answer

Location of the bank 1 sensor 2 O2 sensor on a 2001 ford escape


B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter

You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks

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Oct 20, 2009 | 2001 Ford Escape

1 Answer

Oxygen sensors


you have four on this truck. bank one sensor one is "black and white" b1 s2 "brown" b2s1 "light green" b2 s2 "red/white" good luck post as fixed thanks

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