chucklehead Report post Posted August 3, 2019 Hi, 2004 Murcielago e-gear with 14,000 miles. new to me, has Kreissieg exhaust, I think the cats are in place. Soft exhaust note. my wife was driving and got engine light. She said it was left and right banks. pulled P1426, erased and took test drive. Same error came back. No other codes. Been checking thermocouple and ECU block. Looks ok. I am going to post pics because don’t know what they are supposed to look like. first pic thermocouple in cat second pic thermocouple wire in ECU block third pic ECU block with cover off Quote Share this post Link to post Share on other sites More sharing options...
Old Guy Garage Report post Posted August 3, 2019 From the WM CATALYST TEMPE- RATURE P1426 Functional check |Catalyst temp sensor signal Bank1 - Ca- talyst temp sensor signal Bank2| Quote Share this post Link to post Share on other sites More sharing options...
Old Guy Garage Report post Posted August 3, 2019 I would think if they both thru the code at the same time the actual TC's would not be bad, might have to look elsewhere. Clean the connections first? Did the light come back on a 3rd time? Quote Share this post Link to post Share on other sites More sharing options...
chucklehead Report post Posted August 4, 2019 Thx. Will try cleaning and then see if error code returns. Quote Share this post Link to post Share on other sites More sharing options...
chucklehead Report post Posted August 4, 2019 Seems like Gallardo had updated exhaust ECU/block that doesn’t have corrosion problems. Did the Murcielago receive the same updated part? Quote Share this post Link to post Share on other sites More sharing options...
chucklehead Report post Posted August 5, 2019 Tried cleaning connections and had my wife drive. She is really aggressive and drives it like she means it. Some hesitation around 4000 rpm. Threw codes p1306, p1405 along with p1426. I think that means it is misfiring. Maybe new spark plugs will fix it. Quote Share this post Link to post Share on other sites More sharing options...
chucklehead Report post Posted August 5, 2019 NGK is recommending 4347 instead of 2316. Anyone using this plug? 2004 Murcielago Quote Share this post Link to post Share on other sites More sharing options...
Stimpy Report post Posted August 5, 2019 51 minutes ago, chucklehead said: NGK is recommending 4347 instead of 2316. Anyone using this plug? 2004 Murcielago Do you have a link to this information? NGK makes cross reference tables and I remember the table showing the stock Champion matching to 2316. I am using 2316 in my 04 for a couple of months now with no issues. Quote Share this post Link to post Share on other sites More sharing options...
chucklehead Report post Posted August 5, 2019 Thx. I looked it up on NGK website for 2004 Murcielago i will order NGK 2316. Quote Share this post Link to post Share on other sites More sharing options...
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