SOURCE: Engine codes Po171 Po174 Po401
The vast majotity of Ford vehicles with P0171 and P0174 codes are suffering with a vacuum leak. The biggest culprits are the hoses going to the PCV valve. The rubber deteriorates due to heat and oil fumes. Check the hoses and rubber elbows between the PCV valve and the intake manifold. Pay very close attention to the rubber elbows. They crack on the onside and can be hard to spot.
SOURCE: 01 Mazda Millenia 2.5L check engine light
sounds like its a different sensor causing problem. could be TPS SENSOR OR MAP SENSOR .
SOURCE: the check engine light is flashing in my 2002
This means an error has been detected by your engine management system. The next step is to pull the error codes from the computer and investigate those indications.
SOURCE: 1999 Mazda 626 LX Engine error code 1602
Hi!!
DESCRIPTION & OPERATION
Immobilizer system consist of an ignition key (transponder equipped), coil (part of ignition lock cylinder), immobilizer unit, Powertrain Control Module (PCM), SECURITY light, and related wiring and fuses.
This system requires a key that has been programed into PCM and immobilizer unit to operate vehicle. When a key is used that has not been programed into PCM and immobilizer unit, the first 3 times the PCM will carry out fuel cut-off and ignition cut-off operations and engine will stop in a few seconds. The 4th time or after, engine cannot be started.
SECURITY light will illuminate for 1-2 seconds under normal operation. SECURITY light will flash when key ID does not match stored ID and SECURITY light will stay on when code word of immobilizer unit does not match stored code word.
Anti-theft Code 1602 refers to a miscommunication or no communication between the immobilizer system components, if vehicle starts, it means it is an intermittent problem. Most problems in electronic control system result from faulty wiring or poor electrical connections. To avoid unnecessary component testing, perform a visual inspection first.
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