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?

10

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.

13 Answers

77,735

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

2 out of 2 people think this is helpful.
77,735

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

1 out of 1 people think this is helpful.
56,575

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 out of 1 people think this is helpful.
16,175

p0300 has nothing to do with o2 sensors

2 out of 2 people think this is helpful.
10

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 out of 1 people think this is helpful.
16,175

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 out of 5 people think this is helpful.
56,575

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 out of 2 people think this is helpful.
16,175

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 out of 1 people think this is helpful.

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

56,575

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.

Your Answer

Add photo

Related Questions

  • 2004 silverado Z71 flashing check engine light 46 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 53 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 30 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 147,463 nationwide Silverado 1500 listings starting at $2,000.

ZIP:

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,650
#2 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,440
#3 tenspeed
tenspeed
Reputation 1,350
View All

Related Models For Sale

Used GMC Sierra 1500
1,142 Great Deals out of 57,183 listings starting at $995
Used Ford F-150
3,362 Great Deals out of 205,061 listings starting at $1,273
Used Dodge Ram 1500
572 Great Deals out of 12,810 listings starting at $1,295
Used Chevrolet Silverado 2500HD
425 Great Deals out of 29,177 listings starting at $2,998
Used Toyota Tundra
651 Great Deals out of 27,797 listings starting at $1,599
Used Toyota Tacoma
740 Great Deals out of 32,548 listings starting at $1,900
Used Chevrolet Tahoe
1,059 Great Deals out of 32,283 listings starting at $1,495
Used Ford F-250 Super Duty
457 Great Deals out of 42,343 listings starting at $2,800
Used Chevrolet Camaro
665 Great Deals out of 38,931 listings starting at $2,995
Used Chevrolet Silverado 2500
5 Great Deals out of 254 listings starting at $3,000
Used Chevrolet Silverado 1500HD
14 Great Deals out of 294 listings starting at $4,700
Used Dodge Ram 2500
175 Great Deals out of 5,581 listings starting at $2,900
Used GMC Sierra 2500HD
119 Great Deals out of 13,694 listings starting at $1,500

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
12 Great Deals out of 76,540 listings starting at $20,210
2016 Chevrolet Silverado 1500 For Sale
309 Great Deals out of 18,841 listings starting at $18,498
2015 Chevrolet Silverado 1500 For Sale
329 Great Deals out of 7,609 listings starting at $16,397
2014 Chevrolet Silverado 1500 For Sale
445 Great Deals out of 10,995 listings starting at $10,990
2013 Chevrolet Silverado 1500 For Sale
274 Great Deals out of 6,479 listings starting at $9,950