P0203 : Injector Circuit / Open - Cylinder 3

P0203 means the engine control unit detected an electrical fault (open circuit, short, or out-of-range resistance) in the wiring or driver for the cylinder 3 fuel injector. The injector itself may be fine while the wiring, connector, or ECU driver is at fault. Left unrepaired it causes a cylinder 3 misfire. Typical repair runs about 60 to 350 EUR depending on whether it is wiring or a replacement injector.

P0203 est un code defaut lie a systeme de carburant, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0203 et allume le voyant moteur.

Si ton vehicule a declenche P0203, tu peux remarquer un ou plusieurs de ces symptomes :

• Check engine light illuminated, often flashing under load
• Rough idle and noticeable misfire
• Hesitation or stumble on acceleration
• Loss of power and reduced fuel economy
• Raw fuel or sulphur smell from the exhaust
• Hard starting when cold

Voici les causes les plus courantes de P0203, classees selon la probabilite qu'elles soient en cause :

En general oui, pour des trajets courts. Drivable short-term, but a dead or intermittent cylinder 3 injector causes a misfire that dumps unburnt fuel into the exhaust and can overheat and destroy the catalytic converter. Expect rough running and reduced power. Repair promptly to avoid a much more expensive catalyst replacement.

Suis ces etapes pour identifier la cause profonde de P0203 :

1. Read the stored code and freeze frame with Skanyx to confirm it is P0203 and note the conditions (RPM, load, coolant temp) when it set
2. Check for companion misfire codes (P0300 or P0303) which point to a genuine combustion problem on cylinder 3
3. Inspect the cylinder 3 injector connector and harness for corrosion, looseness, melted pins, or chafing
4. With the engine off, measure the injector winding resistance with a multimeter and compare against the workshop spec (most petrol injectors read roughly 12-17 ohms)
5. Check for the injector control and supply circuits with a multimeter or test light, and swap the suspect injector to another cylinder to see if the fault follows it
6. Note that per-injector coding, flow balance, and quantity-correction values are not on generic OBD2 - read those with a brand tool such as Carly, OBDeleven, or XENTRY, or have a workshop verify them

Les couts de reparation de P0203 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

P0203 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :

Ces codes apparaissent souvent avec P0203 ou indiquent des problemes connexes :