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Model: C-Class W 203, E-Class W 211, CLK W209 and SLK W 171
Engine: engine type 271
Year of manufacture: from 2002
The yellow malfunction indicator lamp on the instrument cluster is on. The customer is complaining about poor engine power and engine misfires.
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.
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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