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P0190 and Repeating P1151 Code on my 1999 Mustang Cobra and Solution
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<blockquote data-quote="CudaCobraSVT" data-source="post: 14850809" data-attributes="member: 136781"><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">I've read these forums for years and benefited a ton by everyone's posts! Thank you all! I figured it was time to give back and relate what I went through debugging and correcting my Po190 and Repeating P1151 codes on my 1999 Mustang Cobra.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">It all started when my 1999 Mustang Cobra kicked out the following Stored Codes</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">P0190 - Fuel Rail Pressure Sensor A Circuit</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">P1151 - Lack Of HO2S21 Switches - Sensor Indicates Lean (see P2197)</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Well first of all, I had one of the best devices I have ever bought.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><a href="http://www.amazon.com/gp/product/B00HVV60HI/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1" target="_blank"><span style="color: #ffffff">Xseries Auto™ WIFI Wireless OBD2 Auto Scanner Adapter Scan Tool to Check Engine Light & Diagnostics</span></a><span style="color: #ffffff"> $16.49 on Amazon. Then all I had to do was buy the iPad app DashCommand for $10. I so not recommend trying to connect to your PC, I couldn't get it to work. This device lets you check and clear codes and monitor and log a tone of stats from my PCM. For an additional $10 I was able to buy a special Ford code pack. So, for $36 bucks I can investigate more info on my Mustang than I know what to do with! </span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Back to the Saga ... the P0190 code was easy to fix. I replaced my 14 year-old fuel pump with a BBK 300 LPH high performance direct replacement fuel pump, probably could have gone cheaper with a Walbro. However, I liked how the BBK said "direct Replacement". And I also replaced the Fuel Filter.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">The P1151 code is an enigma. The cause can be a laundry list of issues. Everything I read about P1151 said it is rarely the Oxygen Sensors, even though the messages seems to point to them. Here's the info I got from</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"> <a href="http://www.obd-codes.com/p1151-ford" target="_blank"><span style="color: #ffffff">ODB-Codes.com</span></a><span style="color: #ffffff">.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">S<em>ymptoms You will likely not notice any drivability problems.</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Causes A code P1151 may mean that one or more of the following has happened:</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Electrical: Short to VPWR in the harness or HO2S Water in the harness connector Open/shorted HO2S circuit Corrosion or poor mating terminals and wiring Damaged HO2S Damaged PCM</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Fuel System: Excessive fuel pressure Leaking/contaminated fuel injectors Leaking fuel pressure regulator Low fuel pressure or running out of fuel Vapor recovery system</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Induction System: Air leaks after the MAF Vacuum Leaks</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>PCV system: Improperly seated engine oil dipstick</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>EGR System: Leaking gasket Stuck EGR valve Leaking diaphragm or EVR</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Base Engine: Oil overfill Cam Timing Cylinder compression Exhaust leaks before or near the HO2S(s)</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><em><span style="color: #ffffff">Read more at: </span><a href="http://www.obd-codes.com/p1151-ford" target="_blank"><span style="color: #ffffff">http://www.obd-codes.com/p1151-ford</span></a></em><span style="color: #ffffff"></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff"><em>Copyright © OBD-Codes.com</em></span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">So I worked my way through the list above. Looked for any bad or wet electrical connections including all 4 O2 Sensors. Everything looked fine.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">I have a Vacuum Pressure gauge and checked for leaks with it. Vacuum was a nice steady -11.4 psi at 2000 RPM. Checked all the vacuum hoses I could fined for leaks. Found one connection at the back of the intake that was hanging half off. Thought maybe that was it, but no dice.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Checked my PCV system and replaced the PCV valve. Dipstick looked like it was seating well and no leak there.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Through all this the code was tripping everyday and then I would reset it. Seemed to happen at low RPM cruising speeds, so I thought maybe it is my Battery or Alternator. I check the output of my Alternator and it was fine at about 13V at idle. I cleaned my battery connections and the P1151 code did not trip for 3 days. Then it tripped. My battery was about 4 years old, so I figured maybe it needs to be replaced so I did. It went a few days before tripping again and then it went back to tripping multiple times a day.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Through all this I was monitoring different stats from my PCM with my OBD2 Scanner and the DashCommand iPad App. I noticed that I was only getting voltage from one Upstream O2 Sensor. No voltage from the other Upstream or the 2 Downstream Sensors. I monitored the voltage at start-up and when the car was all warmed up. I have never monitored these voltages before and I figured it could be a problem with my scanner or something. I learned that the most important are the 2 Upstream sensors, because they are used by the PCM to control Fuel Trims and the 2 Downstream sensors only monitor how well your Cats are working. I also learned that the Upstream O2 sensors will bounce from Lean to Rich and back again multiple times a second. This is how the system works.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">As I said before, throughout this whole saga I did read on many forums that a P1151 Code is rarely an O2 Sensor. However, this was about the last thing to try. So I found all 4 NTK Oxygen Sensors on RockAuto.com for about $27 a piece. Great deal on OEM Ford sensors (I verified this when I pulled the Ford Sensors. They were stamped Ford and NTK).</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">SUCCESS! The code has not tripped for a month and my Cobra is running great. I'm still not getting voltage from one of the Downstream O2 Sensors, but no codes have tripped.</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">If you have any questions or comments Let Me Know!</span></span></span></p><p><span style="color: #333333"><span style="font-family: 'Georgia'"><span style="color: #ffffff">Joe</span></span></span></p></blockquote><p></p>
[QUOTE="CudaCobraSVT, post: 14850809, member: 136781"] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]I've read these forums for years and benefited a ton by everyone's posts! Thank you all! I figured it was time to give back and relate what I went through debugging and correcting my Po190 and Repeating P1151 codes on my 1999 Mustang Cobra. It all started when my 1999 Mustang Cobra kicked out the following Stored Codes[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]P0190 - Fuel Rail Pressure Sensor A Circuit[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]P1151 - Lack Of HO2S21 Switches - Sensor Indicates Lean (see P2197)[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Well first of all, I had one of the best devices I have ever bought.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][URL="http://www.amazon.com/gp/product/B00HVV60HI/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1"][COLOR=#ffffff]Xseries Auto™ WIFI Wireless OBD2 Auto Scanner Adapter Scan Tool to Check Engine Light & Diagnostics[/COLOR][/URL][COLOR=#ffffff] $16.49 on Amazon. Then all I had to do was buy the iPad app DashCommand for $10. I so not recommend trying to connect to your PC, I couldn't get it to work. This device lets you check and clear codes and monitor and log a tone of stats from my PCM. For an additional $10 I was able to buy a special Ford code pack. So, for $36 bucks I can investigate more info on my Mustang than I know what to do with! [/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Back to the Saga ... the P0190 code was easy to fix. I replaced my 14 year-old fuel pump with a BBK 300 LPH high performance direct replacement fuel pump, probably could have gone cheaper with a Walbro. However, I liked how the BBK said "direct Replacement". And I also replaced the Fuel Filter.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]The P1151 code is an enigma. The cause can be a laundry list of issues. Everything I read about P1151 said it is rarely the Oxygen Sensors, even though the messages seems to point to them. Here's the info I got from[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff] [/COLOR][URL="http://www.obd-codes.com/p1151-ford"][COLOR=#ffffff]ODB-Codes.com[/COLOR][/URL][COLOR=#ffffff].[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]S[I]ymptoms You will likely not notice any drivability problems.[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]Causes A code P1151 may mean that one or more of the following has happened:[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]Electrical: Short to VPWR in the harness or HO2S Water in the harness connector Open/shorted HO2S circuit Corrosion or poor mating terminals and wiring Damaged HO2S Damaged PCM[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]Fuel System: Excessive fuel pressure Leaking/contaminated fuel injectors Leaking fuel pressure regulator Low fuel pressure or running out of fuel Vapor recovery system[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]Induction System: Air leaks after the MAF Vacuum Leaks[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]PCV system: Improperly seated engine oil dipstick[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]EGR System: Leaking gasket Stuck EGR valve Leaking diaphragm or EVR[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff][I]Base Engine: Oil overfill Cam Timing Cylinder compression Exhaust leaks before or near the HO2S(s)[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][I][COLOR=#ffffff]Read more at: [/COLOR][URL="http://www.obd-codes.com/p1151-ford"][COLOR=#ffffff]http://www.obd-codes.com/p1151-ford[/COLOR][/URL][/I][COLOR=#ffffff] [I]Copyright © OBD-Codes.com[/I][/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]So I worked my way through the list above. Looked for any bad or wet electrical connections including all 4 O2 Sensors. Everything looked fine.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]I have a Vacuum Pressure gauge and checked for leaks with it. Vacuum was a nice steady -11.4 psi at 2000 RPM. Checked all the vacuum hoses I could fined for leaks. Found one connection at the back of the intake that was hanging half off. Thought maybe that was it, but no dice.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Checked my PCV system and replaced the PCV valve. Dipstick looked like it was seating well and no leak there.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Through all this the code was tripping everyday and then I would reset it. Seemed to happen at low RPM cruising speeds, so I thought maybe it is my Battery or Alternator. I check the output of my Alternator and it was fine at about 13V at idle. I cleaned my battery connections and the P1151 code did not trip for 3 days. Then it tripped. My battery was about 4 years old, so I figured maybe it needs to be replaced so I did. It went a few days before tripping again and then it went back to tripping multiple times a day.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Through all this I was monitoring different stats from my PCM with my OBD2 Scanner and the DashCommand iPad App. I noticed that I was only getting voltage from one Upstream O2 Sensor. No voltage from the other Upstream or the 2 Downstream Sensors. I monitored the voltage at start-up and when the car was all warmed up. I have never monitored these voltages before and I figured it could be a problem with my scanner or something. I learned that the most important are the 2 Upstream sensors, because they are used by the PCM to control Fuel Trims and the 2 Downstream sensors only monitor how well your Cats are working. I also learned that the Upstream O2 sensors will bounce from Lean to Rich and back again multiple times a second. This is how the system works.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]As I said before, throughout this whole saga I did read on many forums that a P1151 Code is rarely an O2 Sensor. However, this was about the last thing to try. So I found all 4 NTK Oxygen Sensors on RockAuto.com for about $27 a piece. Great deal on OEM Ford sensors (I verified this when I pulled the Ford Sensors. They were stamped Ford and NTK).[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]SUCCESS! The code has not tripped for a month and my Cobra is running great. I'm still not getting voltage from one of the Downstream O2 Sensors, but no codes have tripped.[/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]If you have any questions or comments Let Me Know![/COLOR][/FONT][/COLOR] [COLOR=#333333][FONT=Georgia][COLOR=#ffffff]Joe[/COLOR][/FONT][/COLOR] [/QUOTE]
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