You can find a cross-reference listing of O2 sensors that will work on
my web site: www.12claws.com Just pick the cheapest part number from
your local parts house and splice in the wires.
On replacing a 4-wire sensor with a 1-wire: The one wire sensor is a
case ground sensor whereas the 4-wire is an isolated ground.
Substituting in the 1-wire version means your ECU has been left without
a sensor ground. Hopefully this won’t cause any damage, but understand
that it is not operating as it was designed. The odd static discharge
could leave you with a more expensive repair than just the O2 sensor.
John Robison
EOP1 Development Engineer - Oxygen Sensors
e-mail: john.robison@us.bosch.com
Phone: (864) 260-8689
Fax: (864) 260-8118
In reply to a message from Paul M. Novak sent Tue 12 Apr 2005:
Hi Paul, I havn’t done any O2 sensor work on the V12, but I did do
it on my Probe GT. That $45 O2 sensor is a single wire thing…and
your V12 probably has a 4 wire. On my Probe I replaced the
original Mazda 4 wire sensor with a 1 wire sensor, and the cost
saving was $100+ for each one . The original connector was re-used
for the single signal wire. The 4 wire one has a sensor heater to
bring it up to temperature quickly, and the other 2 wires are
ground and signal.I rarely get a CEL in the first few minutes of
running the engine, but that quickly goes away as the sensors heat
up in the exhaust gas flow.Regards.
The original message included these comments:
I’m about to purchase two new oxygen sensors for my 1990 XJ-S, 5.3L
V12 w/
Marelli ignition. I believe the sensors are original and I need to
take the
car in for a CA emissions test soon. The car recently failed the AZ
emissions test for HC and CO but passed NOX.
I have been looking into the prices for the spec Bosch O2 sensors and
they
are quite expensive ($125-$150 each), but have hear that a generic
Bosch
sensor will work ($45 ea) if the existing connector is
spliced/soldered into
place with the proper length.
Is there any truth to this? Can the connector and wire along explain
the
$100 difference. Something doesn’t sound right. Has anyone done
this and
passed an emissions test? It is worth risking/trying? Or should I
just get
John M Holmes 1973 E Type SIII Supra 5-Speed, 1970 SII OTS
Sarnia, Ontario, Canada
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