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P0171 and P017n Was: What tools do I need? (P0420 Bank 1 catalytic inefficiency on a 15 year old dual-cat vehicle)



 
 
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Old August 21st 18, 09:12 PM posted to alt.home.repair,rec.autos.tech
micky
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Default P0171 and P017n Was: What tools do I need? (P0420 Bank 1 catalytic inefficiency on a 15 year old dual-cat vehicle)



I posted this already, and experience tells me both this and the
previous one will probably show up, but it's still strange that the
first one hasn't showen up on my computer in about 3 hours.

In alt.home.repair, on 21 Aug 2018 10:56:52 -0400,
(Scott Dorsey) wrote:


You seem to know what I wish I knew. Pardon me for horning in on this
thread.

>The FIRST thing that I would do would be to swap the upstream sensors from
>side to side and see if the readings move from side to side. If they do,


So the sensors are easy enough to remove and insert to just swap them,
instead of putting in new? Because they cost so much, about $125 (for
Toyotas, a lot more for BMWs I supppose.) (Of course I have the same
code on both banks so I guess I won't be swapping, but taking one out
worried me.)

>you have a bad oxygen sensor.


I have a P0171 (Bank 1 too lean) and the same thing for Bank 2 (P017?)
They tend to point to bad oxygen sensors

2005 Solara Camry Conv. with 3.3L

>If they don't, you need to start looking on
>the engine side for vacuum leaks and bad injectors.


I've looked repeatedly and diligently for vacuum leaks. I've sprayed
starter fluid into every crack. I've checked every hose.

I've cleaned using the special cleaner and then replaced the "filter" in
the air cleaner tube. I've checked the air cleaner and it's clean.

I think I once made the codes disappear for 2 or 3 hours** apparently
after I sprayed Liquid Wrench on the upper 02 sensor behind the
radiator, when I was planning to change the sensor, but I couldn't
reproduce that by spraying again. Still, it makes me think there is a
leak there, in the threads?, that won't be fixed by merely replacing the
sensor.

**Usually the codes reappear 15 minutes after being cleared manually.

I don't know how to check injectors, but since it's both sides and the
car runs evenly, maybe they aren't the problem?

The two symptoms are two lights** on the dashboard and the fact that it
usually stumbles, hesitates, when starting from a dead start, unless I
press the acc just right. **VSC and what I read followed from VSC,
trac off.

From reading I did months ago, I'm thinking the upper 02 sensors are
more likely the problem than the lower ones, and I should replace the
one that is easy to reach.

Or I could diagnose it the way you suggest, but the scan tool I bought
didn't work completely and I returned it. I could buy another.

>You can put a new converter onto this, but it won't stay good for very long
>until you sort out the mixture problems.


So I could be ruining my cat converter?

I'm hoping it's not that bad because I get 31 mpg on the highway, 1 or 2
mpg higher than what Toyota claims for the highway for a 2005 Solara
convertible with 3.3L engine.

It's quite a bit lower in the city and I'm figuring I waste a bunch of
gas every time I leave a stop sign and it stumbles.

>--scott


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