P0171 bank 1 misfire

Leonv

New Member
Joined
Jun 24, 2024
Messages
4
Location
Perth
Car Year
2008
Car Model
Forester
Transmission
Auto
2008 forester sg auto 300 000 km
this code is on occasionally at above 3000 rpm
And petrol usage goes to 22l/100km
I have live data from scanner at time of code but I can not compare it to what should be standard
Have replaced o2 sensor's already but code is back again after some days
help would be appreciated
 
G'day & Welcome (again) @Leonv

Did you use Denso sensors? I'm not sure if your model is MAF or MAP but either way hit 'em with some MAF cleaner.

Air filter OK?
 
The EJ253 SG (MY 2005 to 2008, IIRC) uses a MAP sensor, not a MAF sensor in the inlet manifold.
 
I know my MY'03 is MAP but knew it changed over later but not sure when. ;)
 
Kevin said:
I know my MY'03 is MAP but knew it changed over later but not sure when. ;)
Click to expand...
With the use of the EJ253 engine, Kevin.

I seem to recall starting a thread about the many differences between the EJ253 and EJ251 engines used up until the end of run of the SG Series 1 Forester.

It's here:

Interesting differences between EJ251 and EJ253 engines

Gidday All One way and another, there has been a lot of discussion on the forum about how various models (i.e. engines) perform. After talking to NachaLuva yesterday and comparing the EJ20 in Oswina with the EJ253 in Roo2 (SG series II), I decided to do some basic research ... :iconwink: So I...
www.offroadsubarus.com www.offroadsubarus.com

The EJ253 was used until the MY 2011 SH, IIRC. Heather's MY 2009 certainly uses it.
 
Kevin said:
G'day & Welcome (again) @Leonv

Did you use Denso sensors? I'm not sure if your model is MAF or MAP but either way hit 'em with some MAF cleaner.

Air filter OK?
Click to expand...
I did not install Denso sensors
Filter new
Checked for air leaks
Maf cleaned
 
Our Subies are a bit sensitive with O2 sensors and Denso is the usual recommendation
 
Getting back to Leon's question,

1) :welcome: to this friendly forum, Leon, and

2) Give your engine a good dose of Subaru intake manifold cleaner, if you haven't already done so. This will clean the MAF/MAP sensor.

3) This cleaner needs to be used at every service.

Sorry, I thought I posted this earlier today ...
 
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