Question about 2004 Ford Fusion

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Ford fusion 1.4, 54 reg

Hi, just recently put a new coil pack on my motor and now I keep getting a fault code up. The code is P0420, lambada/cat u/s. Took it for a big burn out and reset the codes, is it possible that the misfire just contaminated the sensor and when I took it for a burn out it will clear the fault?? Read on a site that it would possibly do it, can you advise me on anything else please. Thanks Neil

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  • Expert
  • 132 Answers

Did the fault code return or still clear, generally fault codes are a good indicator not necessarily the source, once had an oxygen sensor that had a fly stuck to it, air filter failed and debris was being sucked through, sensor cleaned new filter did the trick so the sensor was detecting a fault but air intake was the fault specifically air filter.

Posted on Aug 11, 2017

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  • Ford Master
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Hi, what happened is the excess fuel from the misfire has caused the converter to wear out. Replace converter.

Posted on Aug 11, 2017

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Posted on Jan 02, 2017

chuck943
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SOURCE: Ford windstar OBD II code P1537/38, P0171 and P0420

It could all be related.P1537/38 are the intake manifold runner controls are stuck open.They are controlled by vacuum solenoids.The P0171 is bank one of the engine is running lean,usually caused by a vacuum leak, P0420 is catalytic converter efficiency code. The computer monitors the switch rate of the front 02 sensors and compares it to the switch rate of the rear 02 sensors to tell if catalytic converter is doing its job. Now if the front 02 is not switching properly then this will cause this test to fail and set this code.
Look on bottom section of the intake manifold at the back of engine(where tranny bolts up) you should see the vacuum motors there on the intake,these are the control motors for the intake manifold runners.Make sure the vacuum lines are hooked up and lines are not leaking. Also you will see a lever from it to intake make sure they move and are not binding.

Posted on Mar 11, 2009

  • 77 Answers

SOURCE: fault code po420 ; is problem sensors or is it the cat conv

The only thing that will set this code is the catalytic converter or the oxygen sensor behind it. Way to tell if it is the sensor is to monitor voltage reading with scan tool and see if it is fluctuating the same as the upstream oxygen sensor. If it is the converter is "free flowing" and will have to be replaced. If the sensor is "flatlined" then it is most likely bad and setting the code.

Posted on Apr 30, 2009

beduncan
  • 73 Answers

SOURCE: Ford focus zetec 1.6 auto, Misfiring and no power

It's normal for the cat to get hot - given they've replaced everything (just about) that could cause your problem - they have not looked at the injectors and O2 sensors. If you had something burning in the engine bay it was most likely electrical and you should look for burnt wires. You probably have a short in the ignition system or fuel injector wire harness. It's nearly impossible to diag a problem like this without having the car first hand. It must be throwing check engine light codes. Get the codes and post them. Also try a different shop at this point.

Posted on Aug 07, 2009

97F350diesel
  • 1326 Answers

SOURCE: 2003 A4 quattro 1.8T 71000

None really, unless you can prove that Audi was at fault by having defective, inadequate or substandard equipment. You have to have some sort of documented paper trail and will need to prove that it was not a user issue or as a result of neglect. Even then so it's gonna take a miracle for it to be warranted or bought back under the lemon law. Sometimes these types of things take multiple documented complaints to form either a recall to repair or a class action law suit to recall, repurchase or compensate the owners of the vehicles..

Posted on Oct 28, 2009

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1 Answer

Po316 y po303 en Ford tAurud 2003


Cylinder # 3 has a misfire...#1) Defective coil on plug or the spark plug itself...#2) Contaminated fuel injector...See drawings below...The coil pack is the smaller of the two and sits to the rear of engine it is the most probable cause...Although the spark plug or the ignition wire (connection between plug and coil pack) could be at fault...so, before you invest in a new coil pack...Remove from both ends the wire from #3 and switch it with #2...if the fault code changes to p0302 that wire is bad...next Install a new set of plugs....Fault still present? replace the coil pack.....Unless recently changed new plugs and wires are a plus even if fault remains...saailer


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