dcb -
Quote:
Originally Posted by dcb
IIRC, the heated sensor on saturns (HO2S) is the rear one. It is basically a sanity check of the front (non heated) one so the computer knows when to throw a cat or one of a few o2 sensor codes. Pretty sure most obd cars have at least a rear heated sensor but not necessarily a front one, and the front one is the one that you "drive" on.
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I agree, but Honda is really good with emissions, so (these days) all of their sensors are heated. For instance, on my wife's car, both her sensors are heated :
Replacement Oxygen Sensor - Front or rear - Fits 2003 Honda Civic EX 4 Cyl 1.7L
Quote:
Features
Features
Brand: Replacement
Location: Front or rear
Number of Wires: 4
Wiring Type: 15 cm
Product Fit: Universal
Warranty: 1-year, unlimited-mileage warranty
Heated: Yes
Description
UNIVERSAL OXYGEN SENSOR, HEATED, 4-WIRE -- 15 cm long wiring; Includes instructions and butt type connectors; Without plug; A high quality oxygen sensor; Covered by a 1-year unlimited mileage warranty.
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You should be able to eyeball your sensor. If you see 1 or 2 wires, it's probably unheated.
I think the second sensor is always heated because you can't count on the exhaust being hot enough to make the sensor work. It's more than a sanity check, it's for keeping the cat healthy.
CarloSW2