Question about 2001 Toyota Tacoma

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Keep getting "check engine light" on 2001 Toyota Tacoma p/u. SR5. According to diagnostics it's a "upstream sensor". have replaced this sensor 3 times and have replaced the downstream sensor once within the last year and 4 months. Also replaced the catalytic converter. please advise!!!!!!

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  • ljac213185 May 02, 2010

    Thanks so much for the info. After receiving you're answer..I got to thinking... I've been hearing what sounds like a leak for sometime now...but dismissed it because I kept passing inspection. Thanks again ,,,hopefully this gives me another avenue to consider.

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  • Toyota Master
  • 1,619 Answers

Exhaust manifold leaks can cause this reading to keep coming back.

Posted on May 01, 2010

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What does error code 55 mean about ABS light on my 98 Toyota Tacoma SR5 4x4 V-6 engine


Look on each wheel and locate the sensors and the wiring. Make sure there are no disconnected or broken wires.

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No the wires won't likely be the same length

The front upstream sensors, are not the same
Part # as the rear,downstream monitor sensors

Go to Rock Auto.Com & look up your oxygen sensors
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I have a toyota tacoma v6 sr5 and the check engine light came on it runs like it always has.. i just hit 44,000 miles and was wondering if its just a precautionary thing.. ...


Hi and welcome to FixYa!

I strongly suggest that you have the car diagnosed. If the check engine light is on there must be a faulty sensor somewhere and having it scanned will show the fault code. By then we'll know what sensor should be replaced.

Hope this helps and thank you for using FixYa! Have a good one!

Jan 24, 2011 | 2003 Toyota Tacoma

1 Answer

I got a p0141 code on my 2001 tacoma v6 what is the problem


p0141 indicates that the heater in the upstream (#1) oxygen sensor has failed. It will take longer for the O2 sensor to heat up, taking longer for the computer to go into closed loop, which burns more fuel. Replacing this sensor is pretty easy, I believe it involves removing one plug and two bolts. After it's replaced, any auto parts store with a code reader can turn the check engine light off, for free.

Dec 20, 2010 | Toyota Tacoma Cars & Trucks

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Hello i am trying to fix my check engine light and the light is on and the code says its my egr valve is not getting enough flow and causing the light to come on. also dont know where the reset button for...


you don't have a reset button but what you can do is chk for vacuum going to your egr. chek the "vacuum switching valve" VSV and see if you have an "EGR vacuum transducer" those are 2 very common problems with toyotas

Nov 19, 2010 | 2001 Toyota Tacoma

1 Answer

CHECK ENGINE LIGHT JUST CAME ON. SO, HOW CAN I TELL IF MY A/F SENSOR IS BAD ON MY 2001 TOYOTA TACOMA? IT IS PULLING UP CODE P1135 BUT, IS THERE A WAY TO CHECK THE SENSOR ITSELF TO SEE IF IT IS BAD? THAT'S...


the code refers to the air/fuel sensor--heater circuit response, bank 1 sensor 1
That indicates that the HO2S( heated oxygen sensor in the exhaust manifold bank 1) is faulty --possible wiring problem or sensor failure

Oct 16, 2017 | 2001 Toyota Tacoma

1 Answer

Engine code 430 for 2001 toyota highlander


Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Diagnostic Help:
To diagnose a P0430 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilloscope to check the waveforms of both upstream and downstream O2 sensors. The rear reading should vary, the front should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component. hopes this helps thanks

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1 Answer

Toyota tacoma 2003 check engine light is


If the car still runs then the problem is not major but may develop into one if unchecked. The sensors in the engine may have detected problems and should be stored in its ECU. If you have a scanner have it connected to the diagnostics it should give you a clue on what to check out.

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3 Answers

Check engine light is on


P1135 bank 1 sensor 1 is your air/fuel sensor upstream (between manifold and engine on the passenger side). It cost about $179 at most reputable auto parts store. You'll want to run the engine for two minutes before attempting to take off the nuts also be careful not to touch the manifold as it will be hot (use a 12mm box end wrench and or a pair of needle nose vise grips or lastly a dremel tool to grind them off). unplug the old sensor plug the new in and install. pull your positive cable off your battery for 5 minutes and then re-connect. your check engine light should be gone. allow your truck to idle for a few minutes and then take a drive. good luck!

Jun 04, 2009 | 2001 Toyota Tacoma

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