Previa oxygen sensor

This is my first post on this site

My 91 Previa burns too much fuel and there's a bit of black carbon on
the end of the exhaust pipe. I'm pretty sure I need to replace the
oxygen sensor. My question is do I need to replace both sensors or just
the one on the engine side of the catalytic converter.

Any suggestions for a source for the sensor in Canada? Is a universal 4
wire sensor OK? Prices seem to go from about $25 for a universal 4 wire
to $230 for a Denso with the right plug at the local parts store.

"Fred" <waterrat@island.net> wrote in message
news:1143776578.194006.261990@j33g2000cwa.googlegroups.com...[color=blue]
> This is my first post on this site
>
> My 91 Previa burns too much fuel and there's a bit of black carbon on
> the end of the exhaust pipe. I'm pretty sure I need to replace the
> oxygen sensor. My question is do I need to replace both sensors or just
> the one on the engine side of the catalytic converter.[/color]

The sensor on the engine side of the converter controls fuel mixture. The
sensor after the converter lets the ECU know whether the converter is
working or not.
[color=blue]
>
> Any suggestions for a source for the sensor in Canada? Is a universal 4
> wire sensor OK? Prices seem to go from about $25 for a universal 4 wire
> to $230 for a Denso with the right plug at the local parts store.
>[/color]

Just for grins, why not price the sensor at your local Toyota dealer? It
may be less than the OEM one at the local parts store.
--

Ray O
(correct punctuation to reply)

Ray O wrote:[color=blue]
> "Fred" <waterrat@island.net> wrote in message
> news:1143776578.194006.261990@j33g2000cwa.googlegroups.com...[color=green]
> > This is my first post on this site
> >
> > My 91 Previa burns too much fuel and there's a bit of black carbon on
> > the end of the exhaust pipe. I'm pretty sure I need to replace the
> > oxygen sensor. My question is do I need to replace both sensors or just
> > the one on the engine side of the catalytic converter.[/color]
>
> The sensor on the engine side of the converter controls fuel mixture. The
> sensor after the converter lets the ECU know whether the converter is
> working or not.
>[color=green]
> >
> > Any suggestions for a source for the sensor in Canada? Is a universal 4
> > wire sensor OK? Prices seem to go from about $25 for a universal 4 wire
> > to $230 for a Denso with the right plug at the local parts store.
> >[/color]
>
> Just for grins, why not price the sensor at your local Toyota dealer? It
> may be less than the OEM one at the local parts store.
> --
>
> Ray O
> (correct punctuation to reply)[/color]

Thanks, that gets me down to one sensor to buy
The phone call to the dealer is free, but I think the 4 wire universal
at $25 will be a lot less expensive. It's a Denso, which is the brand
Toyota uses, I think. Any opinions on whether it will work?
Fred8

"Fred" <waterrat@island.net> wrote in message
news:1143784484.126854.221970@j33g2000cwa.googlegroups.com...[color=blue]
>
> Ray O wrote:[color=green]
>> "Fred" <waterrat@island.net> wrote in message
>> news:1143776578.194006.261990@j33g2000cwa.googlegroups.com...[color=darkred]
>> > This is my first post on this site
>> >
>> > My 91 Previa burns too much fuel and there's a bit of black carbon on
>> > the end of the exhaust pipe. I'm pretty sure I need to replace the
>> > oxygen sensor. My question is do I need to replace both sensors or just
>> > the one on the engine side of the catalytic converter.[/color]
>>
>> The sensor on the engine side of the converter controls fuel mixture.
>> The
>> sensor after the converter lets the ECU know whether the converter is
>> working or not.
>>[color=darkred]
>> >
>> > Any suggestions for a source for the sensor in Canada? Is a universal 4
>> > wire sensor OK? Prices seem to go from about $25 for a universal 4 wire
>> > to $230 for a Denso with the right plug at the local parts store.
>> >[/color]
>>
>> Just for grins, why not price the sensor at your local Toyota dealer? It
>> may be less than the OEM one at the local parts store.
>> --
>>
>> Ray O
>> (correct punctuation to reply)[/color]
>
> Thanks, that gets me down to one sensor to buy
> The phone call to the dealer is free, but I think the 4 wire universal
> at $25 will be a lot less expensive. It's a Denso, which is the brand
> Toyota uses, I think. Any opinions on whether it will work?
> Fred8
>[/color]

Denso is the OEM supplier for Toyota. The 4 wire universal should work, but
if you're going to start snipping wires, I'd snip the connector off of the
old O2 sensor so that you don't damage the wire harness on the vehicle
itself. If the original sensor has only 2 wires, then you have to figure
out which wires are for the heater, sensor signal, and grounds. I have a
factory manual for a 93 Previa that should be OK if you get stuck.

Good luck!

--

Ray O
(correct punctuation to reply)