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Repair tips

Diagnostics made easy

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Tipp 163

Traction (engine/gearbox)

Mercedes C-Class W 203, E-Class W 211, CLK W209 and SLK W 171, engine type 271, from 2002

Traction (engine/gearbox)

Brand: Mercedes
Model: C-Class W 203, E-Class W 211, CLK W209 and SLK W 171
Specification: -
Engine: engine type 271
Year of manufacture: from 2002

Problems:
The yellow malfunction indicator lamp on the instrument cluster is on. The customer is complaining about poor engine power and engine misfires.

Fault memory:
Fault codes P2029, equivalent to 'Mixture adaptation'; P2046, equivalent to 'Lambda sensor'; P201A, equivalent to 'Ignition circuit'; and P201C, equivalent to 'Mixture under full load Bank 1'.

Preliminary measures taken by the workshop:
Air-mass sensor and lambda sensor have already been replaced, but without success.

Tip from the Technical Call Centre:
This is a mixture fault which can be proved through an emission diagnosis. The fault code 'Ignition circuit' indicates a subsequent fault. If the residual oxygen content is clearly above 0.5%, the engine induces unmetered air anywhere. A common cause in these engines has often been a porous partial load bleeder hose. As it is installed behind the compressor and cannot be seen from above, use the following trick to find the leak: use starter spray and spray once from the bottom up behind the compressor. If the engine run briefly normalises, the leak must be there.

Troubleshooting:
Replace the bleeder hose, but always do so in connection with a new hose clamp as it will not be possible to tighten the worm-gear clamp later on.

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