crackunia Posted April 6, 2017 Share Posted April 6, 2017 Hi there. Got big problem with my car. This is Error code which I get from diagnostic P0031 I googled and learned it was upstream oxygen sensor error. I replaced sensor with OEM one (but not new one). There is same result. Vehicle runs too bad. when I hit gas pedal it wont accelerate at once. there is scary noise nearby engine and then it runs quick. I'll upload video later. Link to comment Share on other sites More sharing options...
Max Capacity Posted April 6, 2017 Share Posted April 6, 2017 I would use a new Denzo sensor. Get it from a local auto parts store. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
crackunia Posted April 6, 2017 Author Share Posted April 6, 2017 thanks for your reply I removed it from Subaru impreza. it was absolutely same size. that sensor worked perfectly on impreza. anyway if anyone has any other opinion please help me. Link to comment Share on other sites More sharing options...
Max Capacity Posted April 6, 2017 Share Posted April 6, 2017 Oh I thought it was laying around on a bench for years. Did you put it back in the other car yet ? Does it still work in that car ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
NotYourAvgSpec.B Posted April 19, 2017 Share Posted April 19, 2017 Can you put a dmm on the o2 sensor and check for proper voltage toggle... Also check resistance of the heater element. Sounds like it's running pig rich at throttle tip in, could be from a post maf air leak Link to comment Share on other sites More sharing options...
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