Sometimes bad PCV valve symptoms are misrecorded as coming from a bad sensor. That's why it's important to check the PCV valve and related components regularly. This is especially true if you own a 2001 or older model, where the PCV system is not monitored by the OBD-II system, and won't illuminate the check engine light if something goes wrong. P0500codes can be caused by: Failed vehicle speed sensor (the sensor itself has died/stopped working) Open or short in the wiring harness (can happen over time due to normal wear and tear) Damaged vehicle speed sensor drive gear (another wear and tear issue) Poor electrical connection (may take a little time to figure out where the connection Theaverage vapor canister purge valve replacement cost is between $50 and $300, depending on the car model and labor costs. While those little plastic components might not look like much, they're not cheap to replace. The part alone usually costs between $30 and $150. From there, you have to factor in labor rates too. Asfar as mechanical problems, it could be a faulty oil pressure sensor, a bad oil pressure gauge, a blocked oil passage, a damaged oil pump relief valve or a dirty oil filter. Understanding all of the reasons helps you determine what might be wrong with your vehicle. 1. Cold Engine. ThePCM will usually NOT set a specific bad crankshaft position sensor diagnostic trouble code (DTC) when the crank sensor goes rogue (goes bad). But, every now and then it does, and when it does you'll get: P0336 CKP Sensor Circuit Performance. P0337 CKP Sensor Circuit Low Frequency Code. P0338 CKP Sensor Circuit High Frequency Code. 1 Engine running hot. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly. If the relay shorts or fails, it will not be able to .

symptoms of a bad vehicle speed sensor