Question about 1997 Geo Metro
Posted by Anonymous on
The o2 sensors may be ok. They read the amount of fuel and air left over in the unburned exhaust. If too much fuel or air present they will set a code. I agree with Johnny... Have the codes reset and see if the light comes back on. If so you need to have a scan done to see what is causing this code to set
Posted on Apr 27, 2015
Check fuse The HO2S 2 heater is powered by the IG-COIL fuse located in Junction Block.
Posted on Apr 28, 2015
After resetting all DTC errors. using the scan tool or , pulling the cab fuse DOME ?
DOME fuse is the suzuki ECU memory fuse.
pulling said fuse, makes it FORGET DTC's
that code is for the heater and that alone. B1S2.
this can mean the wires are cut, to the sensor heater
or the last person used a universal 02 sensor and wired it wrong. (is this a new plug end sensor and how many pins did it have>?)
Im not sure what DEQ is? do say?
B1S2. means down stream oxy sensor heater dead.
bank 1 sensor 2 is the rear sensor not the front so don't mess with the front,
unless rich or want to add problems to engine.
The PCM measures the heater current directly (using series internal resistor. ( the 0.31v is open heater. ) it uses ohms law to do that magic, I= V/R (ECU math)
if the current is 0 the heater is dead, it's that simple!!!
only why remains. (bad wires, bad connections top list of all bad 02 heaters)
NO ENGINE Stated, or country. (i'm guessing USA?)
G10 engine>? or G13 ????
the 97 G10- (means 3 cylinder 1 liter engine)
the ECU /PCM drives the heater directly B1 S2.
Some G10 have only a 1 pin rear sensor. (im looking at all G10s made and sold)
bank2 sensor needs a good ground for it to work
Some have 4 wires sensors. now you know why I asked the pin count on the rear sensor.
FAct 2< Calif and USA fed and Canada cars use different setup and sensors. so........??????
here is the FSM words, read them!
this sensor does not effect mileage
it is used ONLY to test the CAT converter for efficiency.
nothing else. (its a pure smog sensor... if you will)
it don't effect fuel trim or MPG or , other things.
good luck! and post engine size please.
BTW2: once you fix the rear sensor ,the ECU wakes of mr.nasty DTC P0421 tests and now may fail for a bad CAT. (fact)
when the rear sensor dies, the ECU suspends the cat monitor, (does on my 96)
"Trouble Code Conditions: P0141 B1S2
Engine speed over 2000 rpm for 2 minutes, ECT sensor more than 176?F, and the PCM detected the HO2S heater circuit indicated less than 2.5v with HO2S heater turned "off", or that the heater circuit was more than 0.31v with HO2S heater turned "on" for 5 seconds.
HO2S heater control circuit is open or shorted to groundHO2S heater control circuit is shorted to powerHO2S heater power circuit is open (check power from the fuse)HO2S heater is damaged or has failed PCM has failed"
Posted on Apr 27, 2015
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Posted on Jan 02, 2017
Tips for a great answer:
Mar 06, 2012 | 1997 Geo Metro
Here is the daignostic procedure for troubleshooting DTC P0141 (click over each image for zoom)...
Hope this helps to solve it.
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