Fault code is back
#1
Fault code is back
Posted a message on here a week ago about my engine light coming on, plugged it in and it threw up fault code P0420 Catalyst system efficiency below threshold, now a week later the engine warning light is back on, I take it it's the same fault so where doin go from here ? Replace the cat ? Or see if it's a sensor gone ? I rang subaru direct and it's gunna cost me £93 just for them to plug it into there kit, so that's a last resort
Cheers sam
Cheers sam
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cant you borrow ,or buy a cheap replacement s/h cat and pipe inc oxy sensor see if it cures your problem
maybe the change in backpressure since fitting new backbox has fubarred the cat or sensor ???
maybe the change in backpressure since fitting new backbox has fubarred the cat or sensor ???
Last edited by t4and greys; 16 January 2013 at 11:03 PM.
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cat effieceny is normaly what it says on the tin,backbox wont make any difference at all. what inless the cat has collapsed you wont feel any difference driving the car and chances are the 02 sensors are ok hence the fault codes. ur best bet is to get the car on a ramp, normaly if the cat has fell appart or started to you can hear them vibrate in the exhaust when u bang it with your hand. i decated my downpipe and before i got it remaped to clear the code forever if i sat at a steady 60mph for a couple of mins without fail i would get cat efficency code come up but mine was due to it sitting on a shelf at home in the garage.
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Have had exactly the same, light came on with cat below threshold warning code.
Dealer had had a look at it on 3 occaisons now, done select monitor, emissions tests etc, all fine. Each time reset the light and it was a good few weeks before it came back on. It did however co-incide wiht a relatively long motorway journey, and also putting in a certain brand of fuel (at first we thought it may have been a bad batch)
3rd time the took it for a long run and recorded the data at a constant speed of 50 mph, as advise to do by the guys back at Subaru UK.
Apparently this has shown that the O2 sensor and AFR readings were very erratic whcih MAY be a sign that the CAT is on it's way out.
However, as said before everything is running ok and emissions are spot on (just passed MOT today )
Advise from dealer was to just monitor it and see if it comes back and starts to become more frequent in which case may have to replace the cat but otherwise not to worry as it's not causing any problems.
Would suggest you get it checked out once just to make sure everrything is ok, emissions etc and then get a reader off ebay to reset it if it comes back.
Rich
Dealer had had a look at it on 3 occaisons now, done select monitor, emissions tests etc, all fine. Each time reset the light and it was a good few weeks before it came back on. It did however co-incide wiht a relatively long motorway journey, and also putting in a certain brand of fuel (at first we thought it may have been a bad batch)
3rd time the took it for a long run and recorded the data at a constant speed of 50 mph, as advise to do by the guys back at Subaru UK.
Apparently this has shown that the O2 sensor and AFR readings were very erratic whcih MAY be a sign that the CAT is on it's way out.
However, as said before everything is running ok and emissions are spot on (just passed MOT today )
Advise from dealer was to just monitor it and see if it comes back and starts to become more frequent in which case may have to replace the cat but otherwise not to worry as it's not causing any problems.
Would suggest you get it checked out once just to make sure everrything is ok, emissions etc and then get a reader off ebay to reset it if it comes back.
Rich
Last edited by RikTee; 17 January 2013 at 08:19 PM.
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