O2 sensor goes out about every 2 months. 43 code no longer latches in ECU. Replacing O2 sensor restores good running. What could cause the O2 sensors to keep going bad? Is the ECU possibly bad because it doesn't latch code any more even though the check engine light comes on about 5 minutes after starting? Where to from here?

 

Wich brand of O2 are you using?

 

O2 sensor is BOSCH #15710

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deadcat &raquo;</TD></TR><TR><TD CLASS="quote">O2 sensor is BOSCH #15710</TD></TR></TABLE>

i think it's the "My honda hates German electronic thing"

go with oem, almost all the time bosch o2 sensor will have problem, but do check the smog level yourself.

on the newer accord, the sensor from bosch will trigger a CEL

 

i'm kinda clueless honestly man, i'd say go with oem but that cannot be cheap to replace every few months! What kind of gas are you running, any crazy high octane racing fuel or something?

 

Replace it with OEM first. If it eats that one then it's more than likely your ECU. Not sure as to what causes this but a buddy of mine had this same problem.

 

Find out what's ruining them from upstream b4 you throw another O2 sensor at it.
Considering how many Hondas (not just Accords) live to ripe old ages and have never replaced an O2 sensor. And you've had to replace how many?

A full or real time scan may pull up some out-of-range conditions which could stress an O2 sensor.

This reminds me of the guy who kept replacing catalytic converters, never addressing his leaking injector. ....

P

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by P_Adams &raquo;</TD></TR><TR><TD CLASS="quote">

A full or real time scan may pull up some out-of-range conditions which could stress an O2 sensor.

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One thing I've seen is oil leaks from the distributor running down the wiring and fouling the o2 sensor from the outside. But that only applies to the ex model with the o2 in the a-pipe.

I don't know of any way to scan a 91 accord other than checking each sensor individually with a voltmeter. Which isn't a bad idea if everything else checks out.

The first thing I check with a code 43 are fuel pressure and vacuum leaks. (if it has a vacuum leak that will cause the code the idle is probably going to be funky)