Focus MK1 Misfire
24-01-2018, 08:58 PM
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Focus MK1 Misfire
Hi All, Hoping for a bit of help before I give in and end up in a mechanics 
. I Have a Focus MK1 2L Zetec Petrol Blacktop, Until recently it has been performing fine with a service done recently. All of a sudden I felt a judder coming from the engine. I Ran a Diagnostic Scan and came back with a P0304 Code, Misfire Detected. The Scan also showed the following errors P0141 - o2 Sensor Heater Circuit Bank 1 Sensor 2P1131 - Lack of Ho2S11 Switch - Sens Indicates LeanP0171 - System Too Lean Bank 1P0136 - o2 Sensor Circuit Bank 1 Sensor 2Now I'm by no means a mechanic but my understanding would be this is to do with the MAF Sensor and Lambda Sensor may have gone ? Would this the Cause of the misfire ? or not ? I have checked the spark plugs and HT Leads I have checked the Coil but not sure what Ohms Reading I should be getting back as ok. My Next Step would be to check the Injectors and pump again not sure what omhs readings I should be getting for that to be ok.The only other thing recently I have done was given the engine bay a bit of a clean and wiped some oil residue away from the rocker bay area so could it be due to that ? I Have Read the PCV Valve and the IAT Could also be the cause.I'm quite happy having a go at most things so any ideas or suggestions do feel free to mention.While I Had the scanner attached I pulled the latest Live Data Set too which may help diagnose the issue DTC_CNT - 1FUELSYS1 - 0L-FAULTFUELSYS2 - N/ALOAD_PCT(%) - 31.4ETC (F) - 163SHRTFT1 (%) - 0.0LONGFT1 (%) - 0.0RPM (/MIN) - 887VSS - (MPH) - 0SPARKADV ( ' ) - 22IAT (F') - -40MAF (LB/MIN) 0.077TP (%) - 16.1O2SLOC B1S12--B2S----O2B1S1 (V) - 0.035SHRTFTB1S1 (%) - 0.0O2B1S2 (V) 0.000OBDSUP - EOBDMIL_DIST (MILE) - 0Any and all suggestions greatly appreciated many thanks Jamie
. I Have a Focus MK1 2L Zetec Petrol Blacktop, Until recently it has been performing fine with a service done recently. All of a sudden I felt a judder coming from the engine. I Ran a Diagnostic Scan and came back with a P0304 Code, Misfire Detected. The Scan also showed the following errors P0141 - o2 Sensor Heater Circuit Bank 1 Sensor 2P1131 - Lack of Ho2S11 Switch - Sens Indicates LeanP0171 - System Too Lean Bank 1P0136 - o2 Sensor Circuit Bank 1 Sensor 2Now I'm by no means a mechanic but my understanding would be this is to do with the MAF Sensor and Lambda Sensor may have gone ? Would this the Cause of the misfire ? or not ? I have checked the spark plugs and HT Leads I have checked the Coil but not sure what Ohms Reading I should be getting back as ok. My Next Step would be to check the Injectors and pump again not sure what omhs readings I should be getting for that to be ok.The only other thing recently I have done was given the engine bay a bit of a clean and wiped some oil residue away from the rocker bay area so could it be due to that ? I Have Read the PCV Valve and the IAT Could also be the cause.I'm quite happy having a go at most things so any ideas or suggestions do feel free to mention.While I Had the scanner attached I pulled the latest Live Data Set too which may help diagnose the issue DTC_CNT - 1FUELSYS1 - 0L-FAULTFUELSYS2 - N/ALOAD_PCT(%) - 31.4ETC (F) - 163SHRTFT1 (%) - 0.0LONGFT1 (%) - 0.0RPM (/MIN) - 887VSS - (MPH) - 0SPARKADV ( ' ) - 22IAT (F') - -40MAF (LB/MIN) 0.077TP (%) - 16.1O2SLOC B1S12--B2S----O2B1S1 (V) - 0.035SHRTFTB1S1 (%) - 0.0O2B1S2 (V) 0.000OBDSUP - EOBDMIL_DIST (MILE) - 0Any and all suggestions greatly appreciated many thanks Jamie
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