C1343 Diagnostic Trouble Code

C1343 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C1343 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code C1343 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C1343.

Fortunately, C1343 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1343 Trouble Code For Specific Cars

C1343 Sunbeam 12 MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted
C1343 Amc Javelin Air Suspension Front Inflator Solenoid Output Circuit Short To Ground
C1343 Isuzu N-serie SCP (J1850) Invalid or Missing Data for Vehicle Configuration
C1343 Skoda Karoq Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
C1343 Toyota Mark X Oil Temperature Sensor Circuit Short To Ground
C1343 Riley Rm Hydraulic Fluid Pressure/ Flow Circuit Short to Gnd
C1343 Peugeot 108 Dynamic Stability Control Right Rear Valve Malfunction