Replacing air/fuel ratio and oxygen sensors - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 06-24-2013, 06:29 PM
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USA Replacing air/fuel ratio and oxygen sensors

I'm a newbie wanting to help my friend save some money, she was told by a backyard mechanic that her check engine lighht being on is most probably caused by the oxygen sensors [he referred to them as #1 and #2 oxygen sensors] local repair shop gave a verbal quote [without diagnostics] to change the sensors will cost approximately $750. I figure I can buy the sensors and as long as they are accesable by not being in a hard to reach area, I switch them out.

I have not driven over there yet to look at the car, but I hope to make the drive sometime this week. Can someone tell me approximately where the front [upstream] Air / Fuel Ratio sensor and the rear [downstream] o2 sensor is located on a 2011 4 cyl 2.7 L Highlander? Also how many sensors for that engine? As best I can tell from searching for the parts, that the 6 cyl has right and left sensors but it appears that the 4 cyl has only one front and one rear?

Also any tips, tricks, or advice for replacing thse sensors. By the way the vehicle is registered in California USA if that makes any difference. Thanks in advance for any help.
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#2 Old 06-24-2013, 10:37 PM
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OOPS! I just spoke with my friend and found out that it is NOT a 2011, rather it is a 2001, so i will ask this question [with corrections] in the 1st generation forum
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#3 Old 06-24-2013, 10:38 PM
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I'll move it

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#4 Old 06-24-2013, 10:44 PM
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Replacing air/fuel ratio and oxygen sensors

I'm a newbie wanting to help my friend save some money, she was told by a backyard mechanic that her check engine lighht being on is most probably caused by the oxygen sensors [he referred to them as #1 and #2 oxygen sensors] She needs to get this situation corrected so a California Smog test can be performed so that she can renew the registration. A local repair shop gave a verbal quote [without diagnostics] to change the sensors will cost approximately $750. I figure I can buy the sensors and as long as they are accessible and not in a hard to reach area, then I can switch them out.

I have not driven over there yet to look at the car, but I hope to make the drive sometime this week. Can someone tell me approximately where the front [upstream] Air / Fuel Ratio sensor and the rear [downstream] o2 sensor is located on a 2001 4 cyl 2.7 L Highlander? Also how many sensors for that engine? As best I can tell from searching for the parts, that the 6 cyl has right and left sensors but it appears that the 4 cyl has only one front and one rear?

Also any tips, tricks, or advice for replacing these sensors. Thanks in advance for any help.

[Note: This topic was previously posted in the 2nd generation section by mistake, it was initially thought this was a 2011 model, but just found out it's acyually a 2001 so I posted here instead


***MERGED WITH ANOTHER THREAD I MOVED FROM 2ND GEN AREA, SWEENEYP***

Last edited by sweeneyp; 06-24-2013 at 10:48 PM.
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#5 Old 06-25-2013, 06:11 AM
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Go to Advance Auto, borrow their code reader, then you will know which sensors are bad. The front one is fairly easy, the back one against the fire wall will be a nightmare. Years of heat welds that thing in. There are also several other sensors.

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#6 Old 06-25-2013, 12:14 PM
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Amazon Amazon

right now is 16.50 shipped if you have prime.

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#7 Old 06-25-2013, 02:04 PM
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Quote:
Originally Posted by Lastplace View Post
Go to Advance Auto, borrow their code reader, then you will know which sensors are bad. The front one is fairly easy, the back one against the fire wall will be a nightmare. Years of heat welds that thing in. There are also several other sensors.
Thanks Lastplace,
They dont have Advance Auto here in California, but maybe another store has loaners or rentals, if I dont have to replace the one against the firewall then it's worth paying the renatl fee. [or maybe I buy a cheap one?]

You mentioned other sensors, do you mean there are other o2 sensors besides the front and rear? As I understand it, there should be air/fuel ratio sensor[s?] before the catylitic convertor, and oxygen sensor[s?] after the catylitic ?

Does anyone know the error code[s] for these?

Last edited by karlf; 06-25-2013 at 02:47 PM.
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#8 Old 06-25-2013, 02:27 PM
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Originally Posted by Lusid View Post
http://www.amazon.com/Autel-MaxiScan...OBDII+Vehicles

right now is 16.50 shipped if you have prime.
Thanks Lusid!

Looks like a good deal and would be handy to have. I think I'll order that and in the interim hav friend go to a national change auto parts store and see if they will will plug a code scanner into her Highlander and see what errors come up.
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#9 Old 06-25-2013, 09:29 PM
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O2 sensors

Before you spend alot of money or time , check the black rubber hoses that come out of the air filter box. I had this same problem and it was just a loose hose. Cost to me O.
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#10 Old 06-25-2013, 11:34 PM
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Quote:
Originally Posted by forwardho View Post
Before you spend alot of money or time , check the black rubber hoses that come out of the air filter box. I had this same problem and it was just a loose hose. Cost to me O.
Thanks forwardho, will do!
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#11 Old 06-26-2013, 12:56 AM
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Agree. Retrieve the codes then we can opine.

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#12 Old 06-26-2013, 05:33 AM
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Here's start: The 1130's thru the 1150's are popular.

Code Description
P1100 BARO Sensor Circuit.
P1120 Accelerator Pedal Position Sensor Circuit.
P1121 Accelerator Pedal Position Sensor Range/Performance Problem.
P1125 Throttle Control Motor Circuit.
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)
P1133 Air/Fuel Sensor Circuit Response. (Bank 1 Sensor 1)
P1135 Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)
P1150 Air/Fuel Sensor Circuit Range/Performance. (Bank 1 Sensor 2)
P1153 Air/Fuel Sensor Circuit Response. (Bank 1 Sensor 2)
P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)
P1200 Fuel Pump Relay Circuit.
P1300 Igniter Circuit Malfunction - No. 1.
P1310 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.
P1411 EGR Valve Position Sensor Circuit Range/Performance.
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 by-pass Valve Control Circuit.
P1780 Park/Neutral Position Switch Malfunction (Only For A/T) Actron CP9125 PocketScan Code Reader

Read more at: http://www.obd-codes.com/trouble_codes/toyota/
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Last edited by Lastplace; 06-26-2013 at 05:37 AM.
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#13 Old 06-29-2013, 06:30 PM
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OK, I bought an inexpensive code reader [OBD II] and plugged it in, here's the 2 generic DTC's I got...

P0141 - O2 sensor heater circuit malfunction (Bank 1 sensor 2)
P0161 - O2 sensor heater circuit malfunction (Bank 2 sensor 2)

Should I simply go out and get the 2 sensors and replace? I'm not even exactly sure where these are located. Any help advice, questions or comments is appreciated
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#14 Old 06-30-2013, 03:32 PM
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Check engine bay fuse box. I believe there is a sensor heater fuse. The chances of two sensors with bad heaters is rare.

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#15 Old 06-30-2013, 05:15 PM
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Quote:
Originally Posted by AVConsult View Post
Check engine bay fuse box. I believe there is a sensor heater fuse. The chances of two sensors with bad heaters is rare.

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OH, OK, that would easy fix if that's the problem, will check fuses before buying o2 sensors
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