Mercedes-Benz W202 C200 Bosch 0261 200 614 Engine ECU: Two-Cylinder Misfire Reproduced and Repaired

Before this Bosch engine ECU, number 0261 200 614, from a Mercedes-Benz C200 (W202) could be repaired, its fault had to show itself on our testing rig. The fault was a misfire on two cylinders. Our engineers simulated it on the rig, and with the misfire reproduced there, they went on to repair the unit successfully.

The fault the PMS unit came with

What reached us was the PMS unit on its own, with a misfire on two cylinders as the fault the customer reported.

For misfires and Mercedes engine ECUs more widely, see our page on Mercedes engine ECUs and misfires.

Making the misfire happen on our testing rig

Out of the car, the unit had no engine to misfire. The first task was therefore to simulate the fault on our testing rig and have the ECU produce the same two-cylinder misfire on the bench. Reproducing it there gave our engineers the fault itself to work on, rather than a description to take on trust.

Every unit we take in is logged, visually inspected and electrically tested, then diagnosed for its particular fault. On this unit, the record sums that diagnosis up in one step: the misfire, simulated on the rig.

Repairing a sealed Bosch engine ECU

These units are sealed, so repairing one competently depends on bringing the right equipment and specialist experience to it. Component-level work of this kind is carried out by our own engineers in our UK workshop, under a microscope and with temperature-controlled rework equipment.

The job record states the result: the fault was successfully repaired. A unit leaves our workshop only after passing final testing, and this one was then sent back to the customer.

Our guarantee on the work done to this unit covers 24 months, and only the person who posted it to us can claim under it.

Coil pack first, then the repaired ECU

Finishing this job also involves the car. Before the repaired ECU is refitted, the coil pack must be replaced, to avoid damaging the repaired ECU. Refitting it without replacing the coil pack may void the warranty.

That is our own instruction for this repair, not a general statement about the W202. It is the step that takes the repair from our bench back to the car.

Sending a Bosch 0261200614 to our workshop

If the Bosch number on your Mercedes engine ECU reads 0261200614, two details on record may help you check it. 0261 200 614 is on record with the Mercedes number A 018 545 11 32. A Mercedes-Benz C200 (W202) is on record for 0261200614. Which fault a particular unit has is something only diagnosis can show.

We take engine ECUs in by post from across the UK. After diagnosis we contact you with our findings and a quote, and no chargeable work begins until you authorise it. To ask for a quote, contact us through our Repair Form, giving the number you have for the unit.

For a Mercedes engine ECU with another number, see the page where our Mercedes-Benz engine ECU repairs are gathered. You will find several other engine ECUs our engineers handle on our What We Repair page.