Question about 1993 Geo Metro
It measures oxygen content (differentially) and if all fuel is burned fully ,oxy goes to near 0% as does HC.
this ecu is brick dumbb. and can not really give good diagnostic information, until 1996 (usa)
bad sensor? sure,
wires fell off , it, burned off (humm 2000degrees here) and connections rusty?
exhuast leaks near it, making it slam lean for ever. (causing huge rich running and horrid MPG $$$$)
the old cars, did that last comment worse than you can imagine.
many ECU can report O2 sensors, with bad heaters, and sensor stuck high or sensor stuck low,
on this old ECU(relic) it (13) means just STUCK.
as all cars this old that can be , nothing at all related to 02 sensor.
like running max lean, or fully rich all the time,
ill give 2 simple examples.
1: fuel pressure at 60psi bad FPR
2: fuel pressure at 20, FPR stuck open.
3: leaking injectors
4: misfiring, will send a ton of oxygen to the exhaust.
got other symptoms? driving? etc?
you gave year and 1.0L 3cyl facts, very rare here, those facts.
make sure there are no other DTC codes, watch the light blink at least 4 cycles.!
here is fsm words on stuck and test conditions.
Test Conditions: ECT>= 158? , RPM >= 2100., not in throttle fuel cut mode, and charging eff. >= 38% (Alternator or battery not bad)
stuck means it reads 0v all the time
or near 1v all the time.
why?, only remains.
Posted on Apr 13, 2015
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Posted on Jan 02, 2017
When you register for an account (free), the site asks you what car you are driving and then gives you online access to a free manual, including wiring diagrams.
Hope this is helpful,
Posted on Sep 18, 2009
Testimonial: "Bingo: first answer solved problem."
P0012 = "A" Camshaft Position - Timing Over- Retarded (Bank 1). Check the timing chain/belt. It must be loose. Must be replaced ASAP if it is indeed loose.
Posted on Oct 23, 2009
Removal & Installation
Water pump mounting location
Water pump assembly showing rubber seal location
CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
Posted on Mar 06, 2010
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