I recently change my O2 sensor on my 2000 chevy silverado. after replacing bank 1 and 2, I reset the it with the code reader. The check engine light went out but came back on again. Any idea?


Asked by Feb 20, 2014 at 09:09 PM about the 2000 Chevrolet Silverado 1500 Ext Cab Short Bed 4WD

Question type: Maintenance & Repair

My truck wont pass smog.The original code was PO300. It was random misfire, I was
told. I ask my buddy who is a mechanic in Arizona he advise me to change O2 sensor in
stream bank 1 & 2. And to reset it using the code reader. after changing both sensor and
resetting it. The light went out but eventually came back on again. but now the code is
PO 134 and 154. Ideas? Thanks.

16 Answers


Those codes state the the sensors you just put in show no activity, so either there is a wiring problem with the O2 sensor circuits or the sensors you bought are bad. Random misfire can be caused by partial plugged injectors, bad fuel, low fuel pressure, worn spark plugs, high resistance in the ignition system, low coil output. ust a few things to check. HTH

3 of 3 people found this helpful.

I'd put the old O2 back in and then go from there.

2 of 2 people found this helpful.

Yes, code P0300 is random/multi-cylinder misfire. For the P0300 code I'd do a tune up first. Especially if you've got over 100,000 miles on your Silverado. I'd try and return those oxygen sensors, you probably didn't need them. Put the old oxygen sensors back in, tune it up, clear the computer, drive it, and let us know. HTH. -Jim

1 of 1 people found this helpful.

p0300 has nothing to do with o2 sensors

3 of 3 people found this helpful.

I put back the old O2 sensor and did a tune up. Reset the computer and drove it around, the check engine came back on and so did the PO300 code.

1 of 1 people found this helpful.

p0300 engine misfire. On the 4.3 vortec you need to test fuel pressure leakdown to make sure the fuel pressure regulator isn't leaking causing the misfire. What items include your tune-up?

5 of 5 people found this helpful.

Check for good strong spark and injector spray at all the cylinders. A bottle of fuel injector cleaner wouldn't hurt as well. HTH -Jim

2 of 2 people found this helpful.

oh, this is probably a 4.8 or 5.3. for some random reason i thought it was a v6... on those a p0300 is pretty hard to find with no other codes. Usually a bad coil or injector gives a local misfire (ex: p0301). Its gotta be something central like MAF, fuel pump, vacuum leaks, coil, cam sensors. things like that.

1 of 1 people found this helpful.

Can't return o2 sensor cause its electronic I don't think. What is bank 1 & 2?

1 of 1 people found this helpful.

Bank 1 is the side of the engine that the #1 cylinder is on. Bank 2 is the side of the engine that the #2 cylinder is on. With an inline engine everything will be bank 1. HTH. -Jim

A o2 sensor can throw a code of p0300. I just had a o2 s3nsor go bad it was throwing code p0155, p0059 and p0050 and p0300. Changed the o2 sensor drove it all day never had a code at all. The 02 sensor regulates many things. And it can cause a misfire.

What I can suggest when you get random misfire Po 300 my experience usually it's the catalytic converter.failing I would start with plugs wires coils and Oxygen sensors. My truck has 330, OOOO miles on it. As it has aged the engine has not used oil but. The mileage and wear internallly in the engine tend to contamination the spark plugs quicker. THE Catalytic converter last approx 100,OOO before I start getting the misfire codes. MagnaFlow seems to make the best aftermarket catalytic

check you distributor and see if the gear has thinned just fixed a tuck the other day that had the same issue and the disturber gear was bad.

My uncle has a 1999 Chevy Silverado here's the reading for the truck please help


goodknowledge try starting another thread as the original post is 3 years old.

P0300 - Random/ Multiple miss fire, Generally speaking the 02 sensors are not directly connected to this code. Now depending on the engine if you get P0300 + P0132 + any other code in the 1 hundreds, yes you could say the 02 sensors could be an issue, but as the one gut said, random or mult, miss fire, Start's with / but not limited to, bad or worn Spark plugs, bad or clogged injectors, fuel pressure, reg. bad gas, bad coil, or anything in a distributor ( If it has one) plug wire/ wires, could be old and worn, thin insulation, most mechanics will tell you to start with the simple/ cheapest things first and go from there, Spark plugs, Noid lights to check pulse on injectors, make sure they are working, fuel cleaner, through intake, and fuel tank, clean throttle, even if you buy pre-gapped plugs, always check the gap prior to install!! and go from there... Good Luck

Your Answer

Add photo

Related Questions

  • 2004 silverado Z71 flashing check engine light 49 answers

    my check engine light has come on and had started blinking just lately. which means engine misfire. after replacing the plugs and wires the truck seems to have a rough idle and still seems to misfire ...

    2004 Chevrolet Silverado 1500 Z71 Crew Cab Short Bed 4WD


    Maintenance & Repair

  • Check Engine Light. Transmission Solenoid and O2 Sensor. 4 answers

    Auto store scan said my 75 year old father in law needed 1-2 Shift Solenoid and O2 Downstream Sensor for 94 Chevy Silverado. Truck runs and shifts fine, but he cannot get it to pass inspection. He rep...

    1999 Chevrolet Silverado 1500 3 Dr STD 4WD Extended Cab SB


    Maintenance & Repair

  • Engine Shutting off after about 10-20 seconds on 2004 Silverado 1500 60 answers

    Can anyone shed some light on this problem. After driving my 04' Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but...

    2004 Chevrolet Silverado 1500


    Maintenance & Repair

  • check engine light staying 2 answers

    dmorin29 answered about a second ago i have a 2004 silverado and the check engine light came on went to autozone and they scanned it came up o2 sensor replaced it.but service engine light still on d...

    2004 Chevrolet Silverado 1500 Short Bed 4WD


    Maintenance & Repair

  • setting timing marks on 97 Silverado w/5.7 32 answers

    I had my 5.7 rebuilt in a shop and installed it back into my truck a couple months back. Since then the service light has come on for a few days at a time then goes off. I had the codes read at the lo...

    1996 Chevrolet C/K 1500 Silverado Standard Cab SB


    Maintenance & Repair

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 175,749 nationwide Silverado 1500 listings starting at $1,250.


Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,200
#2 Rowefast
Reputation 1,840
#3 Silverado_owner_2006
Reputation 1,630
View All

Related Models For Sale

Used GMC Sierra 1500
822 Great Deals out of 68,199 listings starting at $2,484
Used Ford F-150
2,191 Great Deals out of 206,316 listings starting at $1,499
Used Dodge Ram 1500
454 Great Deals out of 11,152 listings starting at $700
Used Chevrolet Silverado 2500HD
307 Great Deals out of 27,740 listings starting at $1,250
Used Toyota Tundra
440 Great Deals out of 34,312 listings starting at $2,700
Used Toyota Tacoma
541 Great Deals out of 40,814 listings starting at $2,495
Used Chevrolet Tahoe
548 Great Deals out of 29,234 listings starting at $1,699
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford F-250 Super Duty
343 Great Deals out of 46,938 listings starting at $1,895
Used Chevrolet Silverado 2500
8 Great Deals out of 266 listings starting at $3,488
Used Chevrolet Silverado 1500HD
18 Great Deals out of 258 listings starting at $3,985
Used Ford Mustang
474 Great Deals out of 45,735 listings starting at $1,999

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
79 Great Deals out of 123,598 listings starting at $19,843
2016 Chevrolet Silverado 1500 For Sale
134 Great Deals out of 5,649 listings starting at $18,895
2015 Chevrolet Silverado 1500 For Sale
192 Great Deals out of 7,393 listings starting at $12,950
2014 Chevrolet Silverado 1500 For Sale
252 Great Deals out of 10,276 listings starting at $10,900
2013 Chevrolet Silverado 1500 For Sale
146 Great Deals out of 4,968 listings starting at $7,650

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.