Re: Honda Accord Check Engine Light Codes: 1456 & 0171

On May 7, 2:50 pm, delbert brecht <halfs...@[EMAIL PROTECTED]
> wrote:
> techjoh...@[EMAIL PROTECTED]
> 15:40c5e31108-57f7-4f92-9cb4-10bc4f051...@[EMAIL PROTECTED]
>
>
>
> > I spent several hundreds dollars to pass emissions last month.  I was
> > receiving eCU codes P0401 and P0420, which were both resolved after
> > the shop replaced my Catalyst Converter and O2 sensor, but now the
> > "Check Engine" light is back with the following codes:
>
> > 0171 and 1456
>
> > I knew something was wrong since the car had troubles accelerating
> > after being at a complete stop.  It will jerk and sometimes jump.
> > I've never seen these two codes before having the shop work on my
> > car.  Could this be just a mere coincidence or should the shop help
> > fix the problem?
>
> > The Catalyst converter was after market.
>
> > --tj
>
> Would have been nice to have the year of the vehicle.
>
> 0401 code-Sound like the EGR system was acting up before. I assume you
have
> an EGR system or you wouldn't have gotten the 0401 code. Ask the
mechanic
> that worked on it if he addressed that issue. Some on this newsgroup
think
> that a faulty EGR system will cause problems with the cat conv but I
can't
> confirm or deny that. 0420 is catalytic conv efficiency is low. That
should
> have been corrected with the new cat.
>
> 0171 is fuel system too lean. Could be a LOT of different problems.
Plugged
> fuel filter. MAP sensor. Primary O2 sensor. Bad fuel-drain tank and
refill.
> Valve clearance incorrect. Exhaust leakage. Check for air leaks into the
> intake manifold. Could be an oxygen sensor problem. A garage with good
> diagnostic skills should be able to tell you. Perhaps the group will
chime
> in on this code with some more ideas.
>
> 1456 is a problem with the evap emissions control system. Start by
making
> sure the gas cap is on tight. Try a known good gas cap on it. After that
you
> need some trouble shooting skills. There is a solenoid that controls
vacuum
> to the purge canister to clean out the fuel fumes. Perhaps there is a
leak
> in that hose and when the solenoid opens it lets in raw air (thus the
lean
> mix) instead of the expected gas fumes (richer mix). Not much but a
place to
> start.
> --
> Pickleman
> halfs...@[EMAIL PROTECTED]
> Please remove "yourpants" to reply
> 1998 Civic HX MT with 142K
> 2000 CRV EX MT with 98K

Thanks for the feedback.  It's a 1998 Honda Accord 4cyl EX with 212K
miles with a recently replace transmission (50K miles ago).