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Another p420 code
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98ss
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PostPosted: Sat Feb 15, 2014 7:57 pm    Post subject:  Another p420 code Reply with quote

So I was checking the rear o2 sensor by inducing a lean condition, meaning I disconnected one of the vacuum hoses on the throttle body and...the readout on my scanner went to 0V. So I think that means that the rear o2 sensor is toast. Can someone confirm operation voltages for o2 sensors are from 0.1V to 0.9V.
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PostPosted: Sat Mar 15, 2014 2:34 pm    Post subject:  Re: Another p420 code Reply with quote

98ss wrote:
So I was checking the rear o2 sensor by inducing a lean condition, meaning I disconnected one of the vacuum hoses on the throttle body and...the readout on my scanner went to 0V. So I think that means that the rear o2 sensor is toast. Can someone confirm operation voltages for o2 sensors are from 0.1V to 0.9V.

how many miles on the sensors




if you think it still has the original ones i'd replace both..........

you will need wrench with a pivoting head for the rear sensor (might have to go on a lift though..)
since it was designed in such a way *you have to* take it to a shop (should cost no more then $45 to get it installed)


fuel economy jumped from 17mpg back to 35mpg (highway) (and 27.5mpg combined.)for me (still has the p0420 code though).

summer fuel rocks with a whopping 38-40MPG Very Happy


this is what I was getting before both sensors failed at the same time anyways
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PostPosted: Mon Mar 17, 2014 11:11 am    Post subject:  Re: Another p420 code Reply with quote

Impala_03 wrote:
since it was designed in such a way *you have to* take it to a shop (should cost no more then $45 to get it installed)


was designed in such a way so the O2 sensor stays dry from the moisture in the exhaust and stays out of harms way.

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PostPosted: Tue Mar 18, 2014 8:28 pm    Post subject:   Reply with quote

I was playing with my new Torque app Cool and think I ran across this. I'd almost swear your right on with the .1-.9V from what I saw. I'm sneaking the car into work tomorrow, will post what I get here if its any help.
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PostPosted: Wed Mar 19, 2014 12:52 am    Post subject:  Re: Another p420 code Reply with quote

i have 115k miles original sensors. only replace something if you know its bad. even "new" stuff from the parts stores can sometimes have a 1 moth life on a car. if its not broke why spend the money on it?

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PostPosted: Wed Mar 19, 2014 1:01 pm    Post subject:   Reply with quote

OK, heres what I got for reference. Car warmed up, numbers taken during a 20 mile drive. Upstream O2 was constantly adjusting between .2-.8V. The downstream was a very solid .6V.
Hope thats some help!
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PostPosted: Thu Mar 20, 2014 9:26 pm    Post subject:   Reply with quote

Took 5 minutes to replace the sensor. No change, looks like the gm replacement cat is only good for 80k miles. Thanks for the reference voltage.

I did change both sensors with denso sensors.
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PostPosted: Thu Mar 20, 2014 10:16 pm    Post subject:   Reply with quote

98ss wrote:
Took 5 minutes to replace the sensor. No change, looks like the gm replacement cat is only good for 80k miles. Thanks for the reference voltage.

I did change both sensors with denso sensors.


For a reference if you plan on getting a catalytic convertor in the future, I had to get one and it cost about $500 for a Magnaflow universal.

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PostPosted: Fri Mar 21, 2014 1:06 am    Post subject:   Reply with quote

say what? you replaced both oe sensors and it didnt change anything. when you had no hard evidence of it being bad. but someone who likes to replaces parts because they have millage on them said to. i tell you some people with money makes me think it sure dont buy brains.

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PostPosted: Fri Mar 21, 2014 5:56 pm    Post subject:   Reply with quote

Irish_alley wrote:
say what? you replaced both oe sensors and it didnt change anything. when you had no hard evidence of it being bad. but someone who likes to replaces parts because they have millage on them said to. i tell you some people with money makes me think it sure dont buy brains.



The code would come on only at a light and the voltage would drop to 0V. Usually the 02 sensors get lazy after 80k. The 0V kind of made me think that the sensor was messing up. So I took a shot in the dark that after 160K the sensors could be fragged. So I spent 60 bucks, but I kept both sensors. 30 bucks a pop is sure way better than 200 bucks on a cat, but I agree to change a part prematue is silly. On the other hand, I picked up 2 mpg from changing the front sensor, so I figure it will pay for itself quickly since I put about 700 miles per week on the car.
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PostPosted: Sat Mar 22, 2014 3:36 pm    Post subject:   Reply with quote

PushrodPower wrote:
98ss wrote:
Took 5 minutes to replace the sensor. No change, looks like the gm replacement cat is only good for 80k miles. Thanks for the reference voltage.

I did change both sensors with denso sensors.


For a reference if you plan on getting a catalytic convertor in the future, I had to get one and it cost about $500 for a Magnaflow universal.



Wow you get burned on that purchase.
for 500 more you could have gotten a OEM too...

correct aftermarket that meets California standards is only $99..

minus -$120 rebate from selling the "scrap" since no core is required



98ss wrote:
Irish_alley wrote:
say what? you replaced both oe sensors and it didnt change anything. when you had no hard evidence of it being bad. but someone who likes to replaces parts because they have millage on them said to. i tell you some people with money makes me think it sure dont buy brains.



The code would come on only at a light and the voltage would drop to 0V. Usually the 02 sensors get lazy after 80k. The 0V kind of made me think that the sensor was messing up. So I took a shot in the dark that after 160K the sensors could be fragged. So I spent 60 bucks, but I kept both sensors. 30 bucks a pop is sure way better than 200 bucks on a cat, but I agree to change a part prematue is silly. On the other hand, I picked up 2 mpg from changing the front sensor, so I figure it will pay for itself quickly since I put about 700 miles per week on the car.





my went from 17City 23 highway (20mpg combined) to 27MPG combined 35-37HWY city 24-25mpg..
city miles sucks since some stop lights are 2 to 5 min HUGE killer of MPG if you get stuck in to what I call the "RED light Loop"

these sensors do have significant effect to gas mileage


but both my sensors were dead..
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PostPosted: Mon Aug 04, 2014 1:43 am    Post subject:   Reply with quote

That's funny. I just replaced both o2 sensors and the coolant temp sensor on my 05 L's and the p0420 still pops up. I can't even get the car inspected and its really frustrating . Has anyone thought about putting a spacer on the rear o2 sensor? The car still has great gas mileage.

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PostPosted: Mon Aug 04, 2014 11:00 am    Post subject:   Reply with quote

tedy wrote:
That's funny. I just replaced both o2 sensors and the coolant temp sensor on my 05 L's and the p0420 still pops up.


Did you use an AC Delco (or possibly Denso) O2 sensor? If not, that's your problem. These cars have issues with aftermarket oxygen sensors.

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PostPosted: Mon Aug 04, 2014 1:19 pm    Post subject:   Reply with quote

Both sensors are denso. I don't mess with the Bosch parts any more waste of money.

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PostPosted: Tue Aug 05, 2014 9:59 am    Post subject:   Reply with quote

So I have a bit of an update. I found that my rear manifold had a 3 inch crack in it. The crack was on cylinder #2 on the bottom, so the only way to see it was to take it off. I bought a dorman from rockauto and I put the old cat back on to see if it would clear it up. Light is back on. I will change over to the new cat when I get new gaskets. I still average 25-26 mpg.
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