P0421 definition: Bank 1 Catalytic Converter Efficiency is Below Threshold on Cold Start. Issue Severity: MODERATE – Extended driving with this code may cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible. Diagnosis: This trouble code may not have any effect on the driveability of the vehicle, but if left
lots of odd things can happen in fuel injected cars sometimes the reverse of what you may expect. typically a malfunctioning O2 sensor can affect adjustments to TIMING thus for same accelerator position engine revs can rise/fall or become unstable just because O2 sensor is duff. if O2 bad poor acceleration/easy stall is definitely likely due to fluctuation in timing. can also cause pinking
Use a mirror as there is not direct clear sight of the fastener head. Before the starter can be removed from the car there's another couple of tasks: 1/ Remove flexible exhaust section (bend that goes over chasssis) 2/ The starter motor has a little metal bracket fastened to it to support wiring tray.
However the car had its trip to citroen today, for a diagnostic session. The codes I initally pulled where p0234 and p0238 in which i cleared with the elm 327 code reader. Citroen came back with the following codes: P0238 - temp fault, turbo pressure, signal short circuit to positive or open circuit or value too high.
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citroen c4 picasso obd location 2015
