Question about 2002 Chevrolet Silverado 1500

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PO135 code front left sensor bad, should I replace all 4 at the same time? or are the other 3 too difficult to get to?

4.8L 120k odometer my smog check printout says: PO135 02 sensor heater fault (bank 1 sensor 1)

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1 Answer

Have you even studied obd2 systems at all, or you
just want to throw away money?

You use the codes you get to diagnose a system
with the fault,then only replace a part after component
testing & it fails a test

You don't replace every sensor for no reason

You should know the mileage on them & have an
oscilloscope put on them to check switching times

Posted on Nov 28, 2012

  • dirk Nov 28, 2012

    I thougt since 120k on the truck and I was under there and the part is very cheap that it would be a good idea to change all 4 as prevent maint.



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Posted on Jan 02, 2017

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SOURCE: didn't pass smog

did it fail high hc? you could change 4and 6 coils around and see if you get a p0306 that means the coil pack is bad. common on this type.

Posted on Oct 01, 2008

  • 674 Answers

SOURCE: failed smog check

po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth
if it hasnt had an ign tuneup its time.
the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl.
so its just cause and effect.
if ya need any more info let me know
later paul

Posted on Oct 01, 2008

  • 107 Answers

SOURCE: the computer says Random / muliple cylinder misfire detected

look for a vacuum leak

Posted on Feb 27, 2009

  • 110 Answers

SOURCE: I have a 2000 chevy Astro Van with approx 200,000

replace sensor between catalytic convertor and muffler

Posted on May 11, 2010

  • 1857 Answers

SOURCE: Code p0141 02 Sensor Heater Circuit Malfunct Bank #1 Sensor2

after the catalytic converter on the driver side in the exhaust pipe.

Posted on Jul 07, 2010

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Related Questions:

1 Answer

2006 Dodge Caravan Getting Two codes: Po135 and Po141

Sadly people don't know that trouble codes only tell the mechanic what to test, not what to replace. And auto parts stores are in the business of selling parts, not giving advice.
Code 135 means there is a problem with the heater inside the o2 sensor for bank one in front of the catalytic converter. Code 141 means the same thing for the o2 sensor after the cat.
Since it is very rare to have two O2 sensors fail at the same time, chances are the problem is lack of power going to the sensors.
The power circuits would need to be checked which requires a shop manual to get the testing procedures and wiring diagrams.

Aug 05, 2014 | 2006 Dodge Grand Caravan

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Po135 code on 2001 jeep have replaced up stream frt. sensor

Dit you check the fuse? Jeeps many times ha e problems with Bosch sensors due to the slower heating. Best is to use Denso.

Jan 02, 2014 | 2001 Jeep Wrangler

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what engine,, 2Lx4 or 2.5L V6?
first off ,nobody needs to do anything, free country still.
but the 135s are clear.
135= B1S1 bank 1, sensor 1,
on 4 banger its the all important front sensor
on v6 its left front bank sensor.
and the code means, the heater in the sensor id DEAD.
or the wire to it melted and is broking off.
the ECU never lies. about this, the current to the sensor is zero. and bad.
you can buy a bosch sensor in any car store in the USA, (all)
you can use the PNP,plug and play or hand wired. both ways
are 100% effective.
what happens is your motor runs rich until fully warm.
that causes, 3 things (top three of many)
1: cold drive-ablity.
2:wasted fuel.
3 : over works the CAT , cutting its life span a lot.

Mar 28, 2013 | 2005 Suzuki Grand Vitara

1 Answer

I have a 1996 camry code po135 can anyone tell me which o2 sensor to replace the car have 4 o2 sensor i check the code with my code reader it tell me o2 bank-1 sensor -1 where that located at on car.....

Bank one sensor one is on the side with cylinder one and before the catalytic converter.
Please be aware the code is for the heater circuit which may mean the sensor is bad, or the sensor may be ok and the problem is in the heater circuit.

Feb 21, 2013 | 1996 Toyota Camry

1 Answer

2005 dodge grand caravan 3.8 code po135 in stalled new botch o/2 sensor cleared codes drove van check eng light came back on same code whats is going on

Code 135 is for a faulty heater in the O2 sensor. Since you have replaced the sensor the problem is probably the circuit or the power source for the heater.
You'll need to check the heater circuit next.

Jul 29, 2012 | Cars & Trucks

3 Answers

Just bought a 2002 bonneville and the check engine light came on the following day, dealer said it was a oxygen sensor code (0135), is that true and also found out the struts (air) are bad...are they...

PO135 --bad O2 Sensor Heater (maybe)
I would replace the front 2 O2 Sensors

I don't know how you diagnosed the front
Check NAPA to get a ball park on price

Feb 06, 2011 | 2002 Pontiac Bonneville

1 Answer

Codes po135 po741

code P0135 heated O2 sensor bank 1 sensor 1 , heater circuit ( front O2 sensor driver side ) replace O2 sensor

code P0741 this is a transmission code TCC ( torque converter clutch ) stuck off. most likely you need to replace the TCC switch.

Aug 09, 2010 | 1996 Cadillac DeVille

1 Answer

My oxygen sensors are gone, my gas milage is bad. Do I replace both sensors, or just one and which ones?

the common one is the one nearest where the exhaust manifold connects to the engine. it has 4 wires,the two that are the same color are for the o2 heater circuit,and should have a 12vdc reference voltage between ground and each of the wires.the resistance between those same color wires is between 20 and 80 ohms.circuit.
the other two wires are for the signal and that voltage changes with the
throttle,from 1/10 volt to 1 volt .
a lazy sensor will trigger a check engine light.
the front sensor will generate a po135 code in the scanner.

Jan 12, 2010 | 2005 Honda Civic

1 Answer

What does po135, p1131, and p0305 mean on a ford f250 with a 4.6L 2007

PO135 = Upstream Heated Oxygen Sensor Heater (HTR 11) circuit (Bank #1)

P1131 = Lack of upstream Heated Oxygen Sensor (HO2S 11) switch, sensor indicates lean (Bank #1)

P0305 = Cylinder #5 Misfire detected

It looks like you have two separate issues happening. Bank 1 would be the left side of the engine if you were standing in front of the truck looking at the engine. The "upstream" oxygen sensor will be on the exhaust pipe coming from the bank one side of the truck IN FRONT of the catalytic converter. From the codes, it appears that the upstream sensor has gone bad, but the oxygen sensor behind the catalytic converter, or "down stream" is fine.

The misfire on cylinder 5 on the right side of the engine, 2nd one from the front, could be something as simple as a fouled spark plug or a coil malfunction.

To identify if it is a bad coil, swap the #5 cylinder coil with another coil, and see if the misfire follows the relocated coil.

Dec 22, 2009 | 2007 Ford F-250 Super Duty Lariat

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