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Toyota mr2 roadster 2001 engine light on code po141 oxygen sens

Toyota mr2 roadster 2001 engine light on code reads p 0141 oxygen sensor fault bank 1 sensor 2 .there are 3 sensors on exhaust 2 at top positioned left and right prior to cat and 1 at bottom after cat which one should i change assume top right hand one.

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Bank 1 will be whichever side cylinder 1 of your engine is and bank 2 will be the opposite side. It's named bank 1 and bank 2 so that no matter how the engine is laid out, bank 1 is always on the same side as cylinder 1. I cannot say whether the right hand or the left hand one will be bank 1 as I do not know where your cylinder 1 is. The garage should know

Posted on Sep 08, 2009

  • oyster4 Nov 05, 2010

    engine is a 4 cil there is only 1 bank, is sensor # 2 on the left or right side of the exhaust manifold looking from the rear of the car (car is a mid engine with exhaust manifold facing the rear)

  •  PEDRO
    PEDRO Mar 11, 2013

    i have recently had 2 sensors changed and now after 3 months the management light has come on on dash board. a mobile mechanic has said lamba sensor again. help me

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ENGINE LIGHT ON CODES P0141 & P0144


code p 0141 refers to heated oxygen sensor (HO2S) 2 bank 1--heater control--circuit malfunction===causes --wiring---HO2S--- ECM
code p 0144 refers to heated oxygen sensor(HO2S) 3 bank 1--high voltage ===causes wiring short to positive ---HO2S---ECM
also refers to oxygen sensor(O2S) 3 bank 1--high voltage ===causes wiring short to positive---O2S-- ECM
HO2S sensors are the units in the exhaust manifolds or before the cat converters
O2 sensors are after the cat converter
two completely different operations
use the special tool for sensors as the wires are easily damaged from the wrong tool use
as for misfiring you will get a P0300 (0300,0301,0302,0303 etc) depending on which cylinders are misfiring
when checking for misfiring the injectors , (blocked or not firing) are as important as plugs and wires
If the misfiring continues after sensor replacement , replace the ECM with a known good one as it is common to all fault codes and misfiring

Jun 06, 2016 | 2005 Hummer H2 SUV

Tip

Which Oxygen Sensor Is It?


There are many inquiries online about which oxygen sensor to change. Oxygen sensor failure codes are very common on a lot of vehicles. With all of today's vehicles having at least two oxygen sensors and many having three or four of them, it can be a little confusing as to which one is causing the problem.

Before we get into which sensor is which, we need to have a little discussion about oxygen sensor fault codes. There are several different types of oxygen sensor fault codes. Here are just some of the most common ones:

P0135 "Oxygen Sensor Heater Circuit Bank1 Sensor 1"
P0141 "Oxygen Sensor Heater Circuit Bank 1 Sensor 2"
P0147 "Oxygen Sensor Circuit Bank 1 Sensor 3"
P0152 "Oxygen Sensor Voltage High Bank 2 Sensor 1"
P0159 "Oxygen Sensor Slow Response Bank 2 Sensor 2"
P0171 "Oxygen Sensor Lean Sensor 1 Bank 1"
P0172 "Oxygen Sensor Lean Sensor 1 Bank 2"
P0174 "Oxygen Sensor Rich Sensor 1 Bank 1"
P0175 "Oxygen Sensor Rich Sensor 1 Bank 2"

There are many more possible oxygen sensor codes, but I only listed these to make my point. Many times the oxygen sensor code is NOT caused by the oxygen sensor itself. "Lean" or "Rich" oxygen sensor codes (i.e. P0171, P0174) are usually caused by something other than the oxygen sensor. Something is wrong, causing the engine to run lean (not enough fuel or too much air) or causing the engine to run rich (too much fuel or not enough air). In these cases, replacing the oxygen sensor will not fix a thing. (That is, unless you are trying to fix your bank account from having too high of a balance!) The new oxygen sensor will just set the same code as the original one. This is because the oxygen sensor is not CAUSING the problem, it is only REPORTING the problem.

High voltage codes (like P0152 above) can be caused by the oxygen sensor wires being shorted to another wire inside the wiring harness. Sometimes these codes are caused by bad grounds where some other component is trying to ground through the oxygen sensor circuit. Again, replacing the oxygen sensor will not fix this! In short, the problem needs to be diagnosed before running out and buying an oxygen sensor.

Just because a fault code has "Oxygen Sensor" or "O2 Sensor" or "O2S" in its description does not necessarily mean that an oxygen sensor needs to be replaced. Many do-it-yourselfers believe that all there is to fixing the car is to hook it to the "magic box", collect the fault codes and replace the parts the computer tells you to replace. There is nothing further from the truth.

Fault codes only point you toward which SYSTEM is failing. The system must be diagnosed to find the CAUSE of the failure. If this is not done properly, it will only result in wasting a bunch of your money. This is what you were trying to avoid by doing it yourself!

So, after reading all of the above, if you think you still want to replace an oxygen sensor, but don't know which one; here is how to figure it out:

Oxygen sensors are always numbered like this:

Bank 1 Sensor 1
Bank 2 Sensor 1
Bank 1 Sensor 2
Bank 2 Sensor 2

Some manufacturers use a kind of shorthand that reads different, but means the same thing:

Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder #1 is located and, of course, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only one bank and it is always referred to as Bank 1. The exception to the 4 cylinder rule is on certain 4 cylinder engines (specifically, some Toyotas) there are two catalytic converters used. In this case, Bank 1 sensors will still be in the pipe for the catalyst that is connected to cylinder #1 and Bank 2 sensors will be in the other one.

Sensor 1 is always the "upstream" sensor (the one located BEFORE the catalytic converter).
Sensor 2 is always the "downstream" sensor (the one that is located AFTER the catalytic converter).
Sensor 3 refers to the ONLY "downstream" sensor where there are two sensors before the catalyst and only one after the catalyst. On very few vehicles the reference to this reads "Bank 1 Sensor 3".

If you do not know where cylinder #1 is, then you need to get a diagram of the firing order for your engine. Just post a question on FixYa.com and make sure you give the YEAR, MAKE, MODEL, and ENGINE SIZE of your vehicle and one or more of our experts will be happy to tell you how to find cylinder #1.

- DTTECH
ASE Certified Master Automobile Technician


Also check out this article by dttech: What Else Could Be Wrong?

on Apr 29, 2011 | Ford F-150 Cars & Trucks

1 Answer

Rich fuel mixture banks 1&2


Fuel sensors work in the hottest part of the exhaust and are difficult to remove after a period of time. Many mechanics apply a small amount of never seize to the threads to assist in replacement and future removal. However this affects the grounding of the sensor and can cause fault readings. Ask the mechanic if he did that and follow you idea that the sensors may aftermarket and not suitable for yoyr car

Jan 23, 2013 | 2002 Toyota MR2 Spyder

1 Answer

2002 MR2 fuel system too rich bank 1 and bank 2


Peter. The dealer did diagnose the problem. They said the car needed all 3 oxygen sensors replaced. They were replaced and the car is now returning codes p0172 and p0175 which are the only 2 codes coming up when the check engine light came on. My question is if the dealer sold me the incorrect oxygen sensors could this cause the computer to incorrectly set the p0172 and p0175 rich fuel mixture codes. There are no other codes coming up. My plan at this point is to check and clean the MAF, check my fuel pressure, and also the TPS but I did not want to waste my time if it could possibly be that the new oxygen sensors where the problem. Any help would be appreciated.

Jan 21, 2013 | 2002 Toyota MR2 Spyder

2 Answers

How many oxygen sensors in a 2001 chrysler sebring 3.0


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Fig. Heated Oxygen (HO2S) location (sensor 1)-2.4L engine

db6f426.jpg

Fig. Heated Oxygen (HO2S) location (sensor 2)-2.4L engine

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Fig. Heated Oxygen (HO2S) location (bank 1, sensor 2) (bank 2, sensor 2)-2.7L engine

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Fig. Heated Oxygen (HO2S) location (bank 2, sensor 1)-2.7L engine

I hope help you with this (rated this help). Good luck.

Sep 09, 2009 | 2001 Chrysler Sebring

1 Answer

Engine light on code po141 oxygen sens bank 1 sens 2


bank 1 will be whichever side cylinder 1 of your engine is and bank 2 will be the opposite side. It's named bank 1 and bank 2 so that no matter how the engine is laid out, bank 1 is always on the same side as cylinder 1. I cannot say whether the right hand or the left hand one will be bank 1 as I do not know where your cylinder 1 is. The garage should know


Sep 08, 2009 | 2002 Kia Sedona

3 Answers

2001 Toyota corolla hesitates on acceleration


Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

Mar 27, 2009 | 2001 Toyota Corolla

1 Answer

I have problem with code 1126 (toyota 4 runner 2001


Manufacturer Specific Codes

P1100
BARO Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1120 Accelerator Pedal Position Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1121 Accelerator Pedal Position Sensor Range/Performance Problem

P1125 Throttle Control Motor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1126 Magnetic Clutch Circuit

P1127 ETCS Actuator Power Source Circuit

P1128 Throttle Control Motor Lock

P1129 Electric Throttle Control System

P1130 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

P1133 Air/Fuel Sensor Circuit Response (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code

P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

P1150 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 2)

P1153 Air/Fuel Sensor Circuit Response (Bank 1 Sensor 2) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code

P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

P1200 Fuel Pump Relay Circuit

P1300 Igniter Circuit Malfunction - No. 1

P1305 Igniter Circuit Malfunction - No. 2

P1335 No Crankshaft Position Sensor Signal - Engine Running

P1349 VVT System

P1400 Sub-Throttle Position Sensor

P1401 Sub-Throttle Position Sensor Range/Performance Problem

P1405 Turbo Pressure Sensor Circuit

P1406 Turbo Pressure Sensor Range/Performance Problem

P1410 EGR Valve Position Sensor Circuit Malfunction - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1411 EGR Valve Position Sensor Circuit Range/Performance - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1500 Starter Signal Circuit

P1510 Boost Pressure Control Circuit

P1511 Boost Pressure Low

P1512 Boost Pressure High

P1520 Stop Lamp Switch Signal Malfunction

P1565 Cruise Control Main Switch Circuit

P1600 ECM BATT Malfunction

P1605 Knock Control CPU

P1630 Traction Control System

P1633 ECM

P1652 Idle Air Control Valve Control Circuit

P1656 OCV Circuit

P1658 Wastegate Valve Control Circuit

P1661 EGR Circuit

P1662 EGR Bypass Valve Control Circuit

P1700 Vehicle Speed Sensor '2' Circuit Fault

P1705 Direct Clutch Speed Circuit Fault

P1765 Linear Shift Solenoid Circuit Fault

P1780 Park/Neutral Position Switch Malfunction (Only For A/T)

Back To Top Of Toyota Check Engine Light Codes Page

Mar 21, 2009 | 2002 Toyota 4Runner

1 Answer

Check engine light come on fault codes PO165 and PO155


Yes sorry but they both should be replaced. 

Dec 20, 2008 | 2001 Isuzu Rodeo

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