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0420 is for the cat, so scrub that one. I could not find 0517-don't know what that means. 0551 and 0128 are sensor malfunctions, or circuit malfunctions for those two sensors (P/S pressure switch, and Coolant temp. sensor). Before going after that, take heed of 0622 and 0563: 0563 is system voltage too high, 0622 is generator field "F" control circuit malfunction. You have a bad voltage regulator in your alternator-putting out too much current. Try a different alternator-it may clear up the sensor malfunctrions, too.
Posted on Nov 30, 2012
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Posted on Jan 02, 2017
SOURCE: Code P1687
p1687 is for no cluster bus message...this could mean a bad cluster....wiring to the cluster ...or a bad pcm...u should take it to a reputable repair facility for further diagnostics
Posted on Oct 21, 2008
P1494 Leak Detection Pump Switch or Mechanical Fault
Part of the early evaporative emission system. (Fuel tank fumes)
It’s there to allow the computer to run an integrity test of the fuel tank, lines and carbon canister’s ability to contain all of the fumes coming from the tank and all line associated with the system.
The code could be set for a number of reasons such as a faulty gas cap, cracked vacuum lines, solenoids & vent valves stuck to the pump itself.
It can be a very difficult fault to cure being it doesn’t take a very big leak anywhere in the system to set the code and that’s if it’s a leak and not an electrical or mechanical fault.
Posted on Apr 11, 2009
7 out of 10 times that means that one of the cat's have gone bad. Most of the time it happens when your mileage is around 100,000 miles. The only thing is to do is to change the bad cat.
Posted on Aug 30, 2009
if you are the original owner, look in your paperwork. if you cant get to the original owner or they dont have the info, you can go to your dealer, and they can reset it for you. and charge you
or you can just start entering codes till it works, which will take you weeks or more.
Posted on Mar 22, 2010
I assume your Vehicle is an Audi/ VW as this is a VW fault code. The o2 sensors measure the oxygen in the exhaust gases and compare it to the out side air, there by working out how efficiently the the fuel is been burnt. The engine control unit will use this and other information to adjust the fuel quantity being injected. The catalytic converter breaks down certain gases in the exhaust fumes to comply with emission regulations. Some vehicles have an upper o2 sensor [before the cat] and a lower [after the cat]. The readings of the o2 sensors is compared and should be within a certain range. If not a fault will be stored in the memory. The Catalytic converter itself may not be working correctly due to contamination or the baffle may be loose[ usually indicated by a rattle in the exhaust]. One or both o2 sensors could be contaminated with carbon and not giving accurate readings. Also check other silencers for blockages.
Posted on Jun 13, 2010
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