1994 Volvo 850 Turbo Fauly codes of: 443 and 435 What do they mean?
Sparky
find out what 443 means. Ran code check 5 times to ensure my numbers
were correct. Any help would be appreciated.
G Klein
435: Heated Oxygen sensor (HO2S) , Front Slow
Replace the front oxygen sensor make sure that if you
are purchasing from the outside you get the jumper
cable along with the sensor
--
" The road of life can only reveal itself as it is
traveled; each turn in the road reveals a surprise.
Man's future is hidden."
"Sparky" <3...@2.com> wrote in message
news:h2aaev0mnnkqj16ls...@4ax.com...
Mike F
>
> 443: Three-way catalytic converter (TWC) efficiency low
> 435: Heated Oxygen sensor (HO2S) , Front Slow
> Replace the front oxygen sensor make sure that if you
> are purchasing from the outside you get the jumper
> cable along with the sensor
>
Before replacing the oxygen sensor, make sure you don't have any vacuum
leaks. There are some rubber elbows at the intake manifold that
deteriorate. Look at the end of the manifold right behind the power
steering pump, and under the plastic cover for the throttle linkage.
Don't worry about the 443 code now, it's a function of the 435 code.
--
Mike F.
Thornhill (near Toronto), Ont.
Change cant to ca and remove parentheses to email me directly.
Sparky
<"mikef2316()"@attcanada.cant> wrote:
>G Klein wrote:
>>
>> 443: Three-way catalytic converter (TWC) efficiency low
>> 435: Heated Oxygen sensor (HO2S) , Front Slow
>> Replace the front oxygen sensor make sure that if you
>> are purchasing from the outside you get the jumper
>> cable along with the sensor
>>
>
>Before replacing the oxygen sensor, make sure you don't have any vacuum
>leaks. There are some rubber elbows at the intake manifold that
>deteriorate. Look at the end of the manifold right behind the power
>steering pump, and under the plastic cover for the throttle linkage.
>Don't worry about the 443 code now, it's a function of the 435 code.
I have checked the vacuum lines by the throttle and the back drivers
side of th engine. I can't seen to fine the lines near the power
steering pump. Can you be more specific on the location? Are there
other vacuum line I should check as well on a Turbo?
Mike F
The answer is, of course, to check them all. The one at the end of the
intake manifold is hard to spot, it's down at the end of the "log" that
makes up the plenum, in the same place as the throttle body, but at the
other end. Not all cars have one there either. See:
http://www.volvospeed.com/Repair/vacuum_lines.htm
In the top picture the power steering pump is that black block on the
left.
G Klein
--
" The road of life can only reveal itself as it is
traveled; each turn in the road reveals a surprise.
Man's future is hidden."
"Mike F" <"mikef2316()"@attcanada.cant> wrote in
message news:3EE5DE10...@attcanada.cant...
Sparky
<"mikef2316()"@attcanada.cant> wrote:
Mike,
I checked that all the vacuum lines again. The only vacuum line I
could find in the vicinity of the power steering pump near the
thermostat is the one that runs along the top of the engine under the
fuel injector plate. That line is very difficult to see also but it
is intact. Has that vacuum line near the passenger side of the intake
manifold been moved on the 1994 850 turbo model? I recall a service
mechanic telling me several years ago that the vacuum lines were moved
to the top of the engine but were just as big of a problem where they
were moved to on this model.
I reset all the codes last night and the check engine and service
lights remained off for my 44 mile round trip to work. If I had a
faulty Heated O2 sensor or vacuum leak wouldn't the light come right
back on after 22 x 2 miles?
My odometer and trip counter stopped working last week. Do you have
any repair guidance on how to fix this one. I have read it is
probably the gears in the odometer itself but have not seen a
description of the required repair. I'll bet Volvo would charge
around $500 to fix this one.
Sparky
Mike F
>
> The vacuum line usually sets 232 Long term fuel trim
>
Normally, yes, but I've seen 435 with a vacuum leak. And the manuals
suggest checking vacuum leaks (and fuel pressure) for this code. I
think it depends on the condition of other things, including the oxygen
sensor which code is set.
Mike F
>
> Mike,
>
> I checked that all the vacuum lines again. The only vacuum line I
> could find in the vicinity of the power steering pump near the
> thermostat is the one that runs along the top of the engine under the
> fuel injector plate. That line is very difficult to see also but it
> is intact. Has that vacuum line near the passenger side of the intake
> manifold been moved on the 1994 850 turbo model? I recall a service
> mechanic telling me several years ago that the vacuum lines were moved
> to the top of the engine but were just as big of a problem where they
> were moved to on this model.
>
> I reset all the codes last night and the check engine and service
> lights remained off for my 44 mile round trip to work. If I had a
> faulty Heated O2 sensor or vacuum leak wouldn't the light come right
> back on after 22 x 2 miles?
>
> My odometer and trip counter stopped working last week. Do you have
> any repair guidance on how to fix this one. I have read it is
> probably the gears in the odometer itself but have not seen a
> description of the required repair. I'll bet Volvo would charge
> around $500 to fix this one.
>
> Sparky
It's possible that connection is eliminated by the recall, or never has
been on your car. Now that you mention it, I think one of the PCV hoses
is connected to a pipe that runs around the area under the plastic cover
over the spark plugs. And the "neat" thing about those trouble codes is
sometimes they take a while to come back, particularly if the computer
adaptation is reset.
As G Klein says, it's probably the oxygen sensor itself. I just wanted
to make sure you checked the cheap stuff first.
Some have reported good luck cleaning the oxygen sensor as per:
http://au.geocities.com/ozbrick850/engine-o2-quickfix.html
Sparky
Thanks Mike you have been a wealth of info.