BH5 Legacy bogging down

[sh76]

So my Legacy TS-R isn't a happy car. Idling rough, doesn't want to rev, no power (going up hills isn't fun) and the fuel consumption seems to have gone up. Total car noob so any suggestions welcome!

[Swindog]

Less KFC? ;D

[petrolheadjman]

any Check engine lights?

[thorpy]

O2 sensor for sure.

[clintondane]

 thorpy said:

O2 sensor for sure.

Agreed

[Jakee]

Check you codes

:edit: what he means is, have a search on the forum for the process to check for CEL's if you dont know how., and report back what the codes are you're getting.

Its really easy to check and diagnose yourself, then we can help you with what the fix might be.

:edit:

[Prodrivebugeye]

+1 for the o2 sensor. I have a be5 and the mrs has a bh5 and to check the codes you need to look under the dash on the drivers side and there should be two sets of plugs disconnected, a green set and a black set. With the car off connect the two green plugs together and then turn your ignition to on but do NOT start the car. The CEL (check engine light) should start blinking. It should do a series of long flashes and then a series of short ones depending on the codes at the time. The long flashes are the x10 ie so 6 flashes would mean 60 and then if there were 6 fast flashes after that it would mean 66. There's plenty of lists on the net of what error codes mean what but for o2 sensor it should be something like code 32 if I'm not mistaken.

The o2 sensor went in my b4 and had the symptoms you've said

[Guest]

Coil and or plugs. i know o2 sensor plays with fuel consumption ect i have a feeling it wont be that. =)

[sh76]

Thanks guys I had similair issues in my Integra a while back (though not as bad as this) and it was an 02 sensor. I saw a thead on here about getting them cheap from overseas so that could be a plan

[RSB]

Don't mean to mention the obvious, but hows your air filter?

I previously has all sorts of issues with bogging and surging in my RSB, and had a crappy supercheap paper filter in the factory airbox. It looked clean, but had about 50k on it. Swapped it out for a factory paper filter from Subaru and it has totally transformed the car. No bogging, no surging. Better economy and more power across the range.

[Guest]

hey guys i have a similar problem with my GTB running a ej20 with twin turbo setup. i have had these issues for a long time and have replaced the O2 sensor, have had the auto gearbox refurbished about 15000kms ago. i have found the two green plugs under the dash and connected them to try find the error codes but the check engine light doesnt flash but there is a clicking sound coming from the engine bay on and off when usually the check engine light is on when i drive. any ideas?

[rex-leggy]

to check the codes you want to connect the black not the green plugs

[Guest]

ok done that and its relaying a code of 22. from my research and if you guys can confirm is the knock sensor. is that hard to replace and how much would it roughly cost?

[sh76]

Ok, thought I'd dredge this thead up

Even though I wasn't getting the check engine light coming up, I hooked up the plugs and got a 21 - Coolant Temperature Sensor. I scored a 2 pin one and then realised I needed a 3 pin...DOH! Anyway, I replaced that and flushed\new coolant. Also put new plugs and air filter in and car is running sweet. Just thought I'd update in case anyone is having similair issues.

[eKulz]

how much is a new o2 sensor anyway? last time i was checking codes i was getting knock sensor and o2 sensor, replaced the knock sensor.

i dont really notice the car being that slow, but i don't have anything to compare it with. might just replace it anyway..